Abdominal Ultrasound Part 4 by wassanjaya1

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									220    ABDOMINAL ULTRASOUND



      peak incidence before 5 years of age. It occurs in      PANCREAS
      various sites throughout the body.
                                                              Normal appearances
                                                              The acoustic characteristics of the pancreas vary
      Other causes of focal liver lesions
                                                              with age. Pancreatic echogenicity is quite variable
      Liver metastases may occur from most paediatric         and is occasionally hypoechoic in neonates com-
      malignancies, particularly neuroblastoma, rhab-         pared with the adult gland. In older children
      domyosarcoma and Wilms’ tumour (p. 229).                echogenicity is equal to or slightly greater than
      Leukaemia and lymphoma may also cause focal             that of the liver. The pancreas is relatively larger in
      defects in the liver. Liver involvement may be man-     young children than in adults, gradually increasing
      ifested by hepatomegaly with normal liver texture,      with age, reaching adult size in late teens.11 The
      a non-specific sign, or by diffuse coarsened liver      pancreatic duct is often visualized but should not
      texture with or without hepatomegaly.                   be greater than 2 mm in width. The relative
                                                              hypoechogenicity and relatively larger size of the
                                                              normal pancreas in childhood should not be mis-
      Haemangioendothelioma
                                                              interpreted as a sign of probable pancreatitis when
      Vascular tumours account for most benign liver          scanning a child with abdominal pain (Fig. 9.4).
      tumours in childhood, with haemangioendothe-
      liomas being seen more frequently than cavernous
      haemangiomas. Although haemangioendothe-
                                                              Pathology of the pancreas
      lioma may be asymptomatic, infants generally pres-      Pancreatic abnormalities are relatively uncommon
      ent before the age of 6 months with an abdominal        in childhood. Most ultrasound abnormalities are
      mass, respiratory distress, anaemia and cardiac fail-   the result of infiltrative processes associated with
      ure, caused by the shunting of blood from the           other syndromes or diseases (Table 9.1). Focal
      aorta through the tumour. Large tumours may             pancreatic lesions are rare.
      bleed spontaneously, resulting in haemoperi-               Ultrasound is an ideal investigation for evaluat-
      toneum. They may present with jaundice and              ing the paediatric pancreas, as a high-frequency
      increased transaminase levels and 50% of children
      also have cutaneous haemangioma.10
         These tumours are generally multiple, of varying
      echogenicity and may have a complex echotexture
      due to thrombus, calcifications and internal septa-
      tions (Fig. 9.3B). The vascular nature of these
      lesions is demonstrated by a large coeliac axis and
      marked decrease in the size of the aorta below the
      origin of the coeliac axis. The main differential
      diagnosis of multiple haemangioendothelioma is
      from metastatic liver disease, particularly from dis-
      seminated neuroblastoma.
         Although most asymptomatic paediatric hae-
      mangioendotheliomas regress spontaneously, those
      complicated by cardiac failure require active treat-
      ment. Steroids may be administered and serial
      ultrasound scans may be used to monitor the grad-
      ual resolution of the lesion. Angiographic
      embolization or surgical ligation of the major
      feeding vessels of the hepatic artery may be neces-     Figure 9.4 Normal pancreas in a 13-year-old girl—
      sary in severe cases that fail to respond to steroid    relatively hypoechoic and bulky in comparison with the
      therapy.                                                adult gland.
                                                                                          THE PAEDIATRIC ABDOMEN         221


                                                               ●   Measure the anteroposterior diameter of any
 Table 9.1 Paediatric pancreatic abnormalities
                                                                   renal pelvic dilatation in transverse section
 Increased echogenicity                                            through the renal hilum.
 Cystic fibrosis                                               ●   Always scan the bladder immediately after
 —fatty replacement of the pancreas, calcifications, ectatic       micturition, paying attention to the ureteric
   pancreatic duct, coarse texture, cysts
                                                                   orifice and looking for any ureteric or renal
 Pancreatitis
 —hereditary
                                                                   dilatation which may suggest reflux. Measure
 —trauma (physical abuse, road traffic accident)                   any residual volume.
 —congenital anomaly, e.g. choledochal cyst                    ●   Colour Doppler may be helpful in identifying
 —drug toxicity                                                    the ureteric orifice, by locating the jets of urine
 —viral and parasitic infection
                                                                   entering the bladder (Fig. 9.10D).
 Haemochromatosis
 —pancreatic fibrosis, iron deposition in liver and pancreas
 Focal lesions                                                 Normal appearances
 Cysts
 —isolated congenital cyst                                     After birth the renal cortex is relatively hyperechoic
 —autosomal dominant polycystic disease                        compared to the adult kidney, in strong contrast to
 —von Hippel–Lindau disease                                    the hypoechoic medullary pyramids. The outline of
 —Meckel–Gruber syndrome                                       the kidney is often lobulated due to a persistent
 Solid lesions                                                 fetal lobulation. The renal pelvis is relatively
 —primary pancreatic neoplasms are very rare in children       hypoechoic, as the fat deposition seen in the adult
                                                               is not yet present (Fig. 9.5A).
                                                                  Gradually the cortex becomes less hyperechoic
probe demonstrates excellent detail. A water-based             with age, the corticomedullary differentiation
drink may be given to provide an acoustic window.              lessens and fat deposition in the renal sinus becomes
In cases of blunt injury to the abdomen with sus-              more evident. The outline becomes smooth,
pected pancreatic damage, CT is the imaging                    although fetal lobulations do persist in some adult
modality of choice in the acute situation, although            kidneys.
sonography should be used during follow-up to                     Normal postnatal growth of the kidneys, in terms
detect the presence of a pseudocyst.                           of length and volume, is closely related to the height,
                                                               weight and age of the child. Charts giving normal
                                                               age- and weight-related values should routinely be
URINARY TRACT                                                  referred to.12 Errors do occur in measurements of
Ultrasound is the first line of investigation in both          renal length with a potential error in the order of 1
antenatally detected abnormalities and in sympto-              year’s growth.13 Thus follow-up measurements for
matic children.                                                renal growth should not be undertaken at intervals
                                                               of less than 1 year.
●   The bladder should be scanned first, as voiding
    may often occur during the examination.
●   Measurements of both kidneys, either length                Anatomical variants and pathology
    or renal volume, should be taken to highlight
                                                               The duplex system
    any difference in size and to provide a baseline
    for further growth comparison.                             The duplex system is one of the more common
                                                               congenital anomalies, occurring in up to 9% of
●   A variety of planes can be used to view the
                                                               referrals.14 It stems from aberrant budding of
    kidneys in children. Often a posterior approach
                                                               the Wolffian duct in utero, and can take a variety
    is best for obtaining an accurate bipolar length.
                                                               of forms, from complete duplication with two
●   Ensure that renal pelvic dilatation is not                 kidneys, each with a separate ureter, to a partial
    physiological, by rescanning postmicturition.              duplication involving the kidney only. Complete
222    ABDOMINAL ULTRASOUND



                                                                     L
                RT




          A                                                      B

              LS LT                                                  LS




         C                                                       D
      Figure 9.5 (A) Normal neonatal kidney, showing lobulated outline, hyperechoic cortex, increased corticomedullary
      differentiation and reduced renal sinus echoes. (B) Duplex kidney. The upper moiety is dilated with a thin cortex. The
      lower moiety is normal. (C) Same patient as in (B). Dilated ureter (arrow) of the upper moiety of the duplex kidney
      terminating in a uretercoele (arrowhead) seen in the base of the bladder at the vesicoureteric junction.
      (D) Ureterocoele (arrowhead) at the base of the bladder covering the urethral orifice.


      duplication predisposes to reflux, particularly into            urethra, causing bladder outlet obstruction which,
      the lower moiety and subsequently to infection.                 if severe, may result in bilateral hydronephrosis.
         The upper pole moiety of a duplex kidney is                      In the absence of any dilatation, it may be dif-
      more prone to obstruction either secondary to a                 ficult to demonstrate the duplex kidney on ultra-
      ureterocoele or, less commonly, with an obstructed              sound. Generally, the kidney is longer than
      ectopic ureter. In the former case the obstructed               normal and two discrete, hyperechoic sinus
      upper moiety may be associated with a dilated                   echoes can be seen. Ectopic insertion of the upper
      ureter which can be followed to the bladder where               pole ureter in a duplex system is a cause of urinary
      a ureterocoele, that is, a cystic dilatation of the dis-        incontinence in girls. It may not be possible to
      tal ureter, may be seen within the bladder at the               follow an ectopic ureter to its distal end, even
      ipsilateral vesicoureteric junction (Fig. 9.5 B, C              when dilated, but one may be able to demonstrate
      and D). The ureterocoele may extend into the                    that the ureter is passing distally to the bladder.
                                                                                     THE PAEDIATRIC ABDOMEN           223


When there is a strong clinical suspicion of an              A dimercaptosuccinic acid (DMSA) scan may
ectopic ureter an intravenous urogram or MR              demonstrate the isthmus or bridge of renal tissue
urogram will be required to identify a duplex            (when the ultrasound scan is equivocal) but only if
kidney and site of ureteric insertion.                   it is functioning. In some cases the bridge is com-
                                                         posed of non-functioning, fibrous tissue.
                                                             Fusion can take other forms, including an L
Renal fusion and ectopia
                                                         shape, where one kidney lies horizontally across
The horseshoe kidney is the most common form of          the midline; crossed ectopia, where both kidneys
renal fusion, in which the lower poles of the kidneys    lie on the same side; H-shaped fusion of the hilar
are fused with a central isthmus or ‘bridge’ across      regions; and complete fusion to form a ‘cake’-
the front of the spine (Fig. 9.6). The isthmus fre-      shaped solitary kidney.
quently lies behind gas-filled bowel and can be diffi-       Ectopic kidneys occur most frequently in the
cult to detect. The sonographer should be suspicious     pelvis (Fig. 9.7). In rare cases the kidney may be
of a horseshoe kidney when the lower poles of the        situated in the thorax.
kidneys cannot be clearly outlined, particularly when        Ectopic and horseshoe kidneys are often associ-
both kidneys look a little smaller than expected for     ated with a degree of malrotation of the kidney.
age. Always ensure you see the outline of the lower      This can be associated with a degree of obstruction
poles clearly by turning the child prone or by scan-     at the pelviureteric junction, and predispose to the
ning coronally through the side if necessary.            development of renal calculi.




           RK




     A                                              B




                                                         Figure 9.6 (A) The lower pole of this right kidney (RK)
                                                         could not be successfully demonstrated. Horseshoe kidney
                                                         was suspected, and confirmed on coronal scanning planes.
                                                         (B) Longitudinal section (LS) in the midline shows the
                                                         renal isthmus of a horseshoe kidney anterior to the aorta.
                                                         (C) Transverse section (TS) through the lower abdomen
                                                         demonstrates the isthmus anterior to the spine.




C
224    ABDOMINAL ULTRASOUND




                                                        b




                                A                             B
      Figure 9.7 (A) Pelvic kidney (b = bladder). (B) Dimercaptosuccinic acid (DMSA) scintigraphy shows 33% function in
      the smaller, pelvic RK and 66% in the left kidney (LK).


      Renal agenesis
                                                                  malignancy and hypertension in later life. The kid-
      The kidneys form from the ureteric bud, which               ney gradually involutes and often completely dis-
      arises from the pelvic area during the fifth to sixth       appears (Fig. 9.8A, B). Surgical removal is
      week of gestation. The bud undergoes numerous               unnecessary unless symptomatic due to its large
      divisions, forming the ureters, renal pelvis, calyces       size or is associated with repeated episodes of infec-
      and renal tubules. Any interruption of this process         tion. Provided the contralateral kidney is normal,
      may cause renal agenesis or ectopia.                        with good function, the prognosis is good. There
         Bilateral renal agenesis is lethal and is usually        is, however, an increased risk of associated urinary
      diagnosed prenatally. The incidence of unilateral           tract anomalies, such as ureterocoele, vesi-
      renal agenesis is about 1:450 live births and is usu-       coureteric reflux or contralateral pelviureteric junc-
      ally prenatally detected. Ultrasound is useful in           tion obstruction, which may predispose to
      confirming the prenatal diagnosis and excluding             infection. These can be demonstrated with ultra-
      the presence of an ectopic kidney. A DMSA scan              sound and micturating cysto-urethrogram.
      confirms the diagnosis. Renal agenesis is associated            A DMSA scan differentiates MCDK, which is
      with VATER syndrome and with ipsilateral gynae-             completely non-functioning, from a grossly
      cological anomalies in girls.                               hydronephrotic kidney, a distinction which may
                                                                  sometimes be difficult to make on ultrasound.
                                                                  Follow-up ultrasound scanning is generally advised
      Multicystic dysplastic kidney (MCDK)
                                                                  in view of the slight increased risk of Wilms’
      The MCDK is generally the result of complete,               tumour and to monitor the growth of the con-
      early ureteric obstruction in utero before 10 weeks,        tralateral kidney.
      and is frequently diagnosed antenatally. The result-
      ing kidney is non-functioning and contains cysts of
                                                                  Polycystic disease of the kidneys
      varying sizes, separated by echogenic ‘dysplastic’
      renal parenchyma. In general the cysts do not com-          Autosomal recessive polycystic disease of the kid-
      municate but occasionally some communication                ney (ARPCDK: infantile) may be diagnosed prena-
      can be seen, making differentiation from a severe           tally. Both kidneys are abnormal, being large and
      hydronephrosis difficult.                                   hyperechoic, with loss of corticomedullary differ-
         MCDK is usually unilateral and is considered a           entiation (Fig. 9.8C). There is a spectrum of sever-
      benign condition, although there is a slight risk of        ity of disease and in some cases it may present later
                                                                                          THE PAEDIATRIC ABDOMEN           225




                                                                                                    + 78




               A




            20.3 mm
                                                        C




        B
Figure 9.8 (A) Multicystic dysplastic kidney. (B) This multicystic dysplastic kidney, diagnosed antenatally, has shrunk
to little over 2 cm in length by the age of 1 year. (C) Large, hyperechoic kidneys in a neonate in autosomal recessive
polycystic disease.


in childhood with the milder, juvenile form of the                Postnatal ultrasound scans should be performed
disease. Prenatally the less severe forms appear nor-         when the infant is more than 4 days old, because
mal on ultrasound. ARPCDK is associated with                  there is commonly a period of dehydration immedi-
hepatic fibrosis and portal hypertension.                     ately after birth. This may cause an obstructed or
   Autosomal dominant polycystic disease of the kid-          otherwise dilated kidney to appear normal for the
ney (ADPCDK: adult) also has a wide spectrum of               first few days of life. If normal a follow-up scan is gen-
severity. Although it tends to present later in life, the     erally recommended at about the age of 6 weeks.
more severe forms can present in childhood and can                The presence of any calyceal dilatation or ureteric
occasionally be diagnosed prenatally. Frank cysts can         dilatation, as opposed to dilatation confined to the
usually be demonstrated on ultrasound, but may not            renal pelvis, is an important factor to note, indicating
be detected until the second or third decade of life.         a greater degree of severity. A measurement of the
The disease is also associated with cysts in the liver        anteroposterior diameter of the dilated intrarenal
and pancreas, and with intracranial berry aneurysms.          pelvis is a useful baseline from which to compare sub-
                                                              sequent follow-up scans (Fig. 9.9D). It should be
                                                              noted that slight separation of the renal pelvis is a
Renal dilatation
                                                              normal finding in the newborn: an anteroposterior
Hydronephrosis is frequently detected antenatally,            renal pelvis of 5 mm is the upper limit of normal.
although the cause may be difficult to demonstrate.               The presence of a baggy, extrarenal pelvis, less
Dilatation is due either to obstructive uropathy, for         than 10 mm, without pelvicalyceal system (PCS)
example vesico- or pelviureteric junction obstruction,        dilatation is usually managed conservatively using
posterior urethral valves or obstructed upper moiety          ultrasound monitoring to demonstrate any increas-
of a duplex kidney (Fig. 9.9), or it may be non-              ing dilatation. PCS dilatation with a renal pelvic
obstructive, for example due to reflux (Fig. 9.10).           diameter of between 10 and 20 mm is more serious
226    ABDOMINAL ULTRASOUND




           A                                                       B




                    C                                              D
      Figure 9.9 Renal dilatation. (A) Dilatation of the pelvicalyceal system (PCS) due to pelviureteric junction obstruction.
      (B) TS of the same kidney. The ureter was not dilated. (C) Duplex RK with gross dilatation of the lower pole moiety
      containing echoes due to infection. The cortex is thin. The smaller upper pole moiety is also dilated. A ureterocoele was
      present at the right vesioureteric junction (VUJ). (D) Mild dilatation of the LK. An anteroposterior (AP) measurement of
      the PCS provides a good baseline for follow-up.




      and likely to require an assessment of renal function         The diagnosis is confirmed by fluoroscopic mic-
      with a MAG3 renogram. Conservative treatment is               turating cystography. This diagnosis may be sus-
      possible, but surgery may be required for very poor           pected sonographically by the association of bilateral
      function.                                                     hydronephrosis with a distended and thick-walled
         The dilated renal tract is predisposed to infection        bladder.
      due to ascending infection in reflux or haematoge-
      nous infection in an obstructed system, where a
                                                                    Vesicoureteric reflux
      pyonephrosis requiring percutaneous nephrostomy
      may develop. As a consequence antibiotic prophy-              Vesicoureteric reflux, the retrograde passage of
      laxis is frequently advised in the neonate with signif-       urine from the bladder up the ureter and into the
      icant renal tract dilatation.                                 kidney, predisposes the child to urinary tract infec-
         Bilateral renal tract dilatation in boys may be due        tion and the development of reflux nephropathy.
      to posterior urethral valves with secondary dilatation        In the first year of life only, reflux is more com-
      of the upper tracts due to the urethral obstruction.          mon in boys than in girls and is usually more
                                                                                          THE PAEDIATRIC ABDOMEN             227




          A                                                    B




      C                                                  D
Figure 9.10 (A) Mild PCS dilatation due to reflux. (B) The right lower ureter is dilated (arrowheads) and urine was
seen to reflux back up the ureter, dilating the kidney. (C) Bilateral reflux (right worse than left) is observed in a TS
through the base of the bladder. Both ureters (arrows) are seen to dilate intermittently. (D) Compare (C) with a normal
patient, in whom the vesicoureteric junctions can be identified by the presence of jets on colour Doppler. No ureteric
dilatation can be demonstrated either before or after micturition.
                                                                                                               (Continued)

severe.15 Conversely, after the first year of life               Children who have had one or more episodes of
reflux is more likely to present in girls and is often        urinary tract infection should be investigated to
less severe. Vesicoureteric reflux is a common                search for an underlying cause and to identify evi-
cause of hydronephrosis antenatally, accounting               dence of reflux nephropathy (Tables 9.2 and 9.3).
for up to 38% of all prenatal urinary tract dilata-           Approximately 2% of boys and 8% of girls will
tions, requiring ultrasound follow-up and anti-               develop at least one urinary tract infection by 10
biotic prophylaxis.16,17                                      years of age, requiring investigation, and in most
   Reflux may either be due to a developmental                centres will account for a substantial proportion of
anomaly at the vesicoureteric junction, or the                the paediatric sonography performed.
result of a neurogenic bladder, partial outlet                   Reflux itself is not reliably diagnosed by ultra-
obstruction or foreign bodies such as calculi and             sound as it is possible to have intermittent reflux in
the presence of a catheter.                                   the presence of a normal ultrasound scan, with a
228    ABDOMINAL ULTRASOUND



                                                              POSTERIOR




                            E                                F
      Figure 9.10 cont’d (E) Small, scarred RK, due to reflux. (F) DMSA scan showing bilateral renal scarring due to reflux.
      Note in particular two wedge-shaped scars in the RK.


                                                                   Although most commonly performed convention-
       Table 9.2 Conditions associated with urinary tract
       infection (UTI)                                             ally by fluoroscopy using iodinated contrast
                                                                   medium, radionuclide cystography and more
       ●   Vesicoureteric reflux                                   recently contrast sonocystography have been used
       ●   Obstruction                                             as an alternative, particularly in the older child.18
           —pelviureteric junction                                    The most common complication of reflux is infec-
           —vesicoureteric junction                                tion and most children present with at least one
           —posterior urethral valves                              episode of urinary tract infection. This can cause
           —duplex kidney with obstructed moiety/ectopic ureter    renal scarring. It is important to make the diagnosis
           —ureterocoele                                           of vesicoureteric reflux and renal scarring early in
       ●   Other structural anomalies
                                                                   order to prescribe prophylactic antibiotics in an
           —duplex and/or ectopic renal anatomy
                                                                   attempt to avoid the damaging complications caused
           —multicystic dysplastic kidney
           —prune belly syndrome                                   by reflux of infected urine. The ultrasound appear-
       ●   Calculi                                                 ances of scarring include a focal reduction in cortical
       ●   Neurogenic bladder                                      thickness, irregular outline, interruption of or loss of
                                                                   the renal capsule echo or a disruption in the renal
                                                                   architecture. Colour flow and power Doppler may
                                                                   show triangular areas of decreased or absent blood
      non-dilated urinary tract.17,18 There may be evidence        flow (and occasionally increased flow) and can
      of thickening of the uroepithelium of the renal pelvis       improve the detection rate of focal scarring on
      due to intermittent renal pelvis distension. Uni- or         sonography.19 These signs can be difficult to demon-
      bilateral dilatation may be present to a mild or severe      strate in young children’s kidneys, particularly when
      degree and may involve the kidney and/or ureter              highly lobulated, and the most reliable method of
      (Fig. 9.10). It is important to scan the renal pelves        scar detection is a DMSA scan (Fig. 9.10F).
      and ureteric orifice immediately after micturition,             Chronic reflux nephropathy leads to failure of
      when intermittent dilatation due to reflux may be            renal growth, resulting in a shrivelled, poorly
      demonstrated on an otherwise normal scan.                    functioning kidney. Measurements of the maximum
         When dilatation is seen, the exact cause may be           length of the kidneys should be routinely performed,
      uncertain unless reflux is actually visualized, which        and can be related to age, height and weight.12 A dif-
      is rare, and micturating cystography is required.            ference in renal length of more than 10% between
                                                                                               THE PAEDIATRIC ABDOMEN            229



 Table 9.3 Imaging the paediatric renal tract

 Ultrasound                                     First-line investigation in all cases. Excellent structural detail
                                                Limited sensitivity for duplex kidneys, reflux, ureteral pathology and small
                                                scars
                                                Monitoring of disease progression
                                                Monitoring of treatment
 Contrast sonocystography                       Alternative to X-ray or radionuclide cystography. Poor structural detail,
                                                   unsuitable for the demonstration of urethral anomalies
 Diuretic renogram (dynamic) Tc99m MAG3         Outlines the pelvicalyceal system. Diagnosis of obstruction and relative renal
                                                function by analysis of excretion curves
 Radionuclide cystography (dynamic)             Diagnosis of reflux
 Direct (via catheter or suprapubic injection
 of isotope into the bladder) or indirect
 (following diuretic renogram)
 Cortical scintigraphy (static)—Tc99m DMSA      Demonstrates uptake in the renal cortex
                                                Superior detection of renal scarring in vesicoureteric reflux and acute
                                                pyelonephritis
                                                Demonstration of congenital anomalies, e.g. ectopic or solitary kidney
                                                Analysis of differential renal function
 Intravenous urography (IVU)                    Limited use in children
                                                Assessment of level of ureteric obstruction
                                                Assessment of congenital anomalies, e.g. ectopic ureters and duplex kidney
                                                Postoperative evaluation
 Micturating cystourethrogram                   Accurate diagnosis of reflux, polyps, diverticula, strictures and urethral
                                                anomalies, but involving a significant radiation dose
 Plain X-ray                                    Some calculi, mainly those in the ureter
                                                Of limited value in paediatric renal work-up
                                                May show gross spinal anomalies
 CT                                             Reserved mainly for confirmation and staging of malignant tumours, due to
                                                significant radiation dose
                                                Renal trauma
                                                Increasingly used for ureteric calculus detection
 MRI                                            Assessment of difficult congenital anomalies and focal masses. Staging of
                                                malignancy




the two kidneys should prompt further investigation              infection may also undergo haematogenous spread
into renal function with a DMSA scan.                            to the spleen and liver, where it can result in multi-
                                                                 focal abscess formation.
Fungal infection
                                                                 Wilms’ tumour
Candidiasis is a fungal infection which is most
commonly seen in infants who are acutely ill or                  The most common paediatric renal malignancy,
immunocompromised or in sick ventilated                          Wilms’ tumour usually presents before the age of 3
neonates. Fungal balls dilate and may obstruct the               years. Although the lesion generally occurs in previ-
collecting system of the kidney (Fig. 9.11).                     ously fit individuals, there are several known predis-
Ultrasound is particularly useful in making the                  posing conditions, including hemihypertrophy,
diagnosis by demonstrating the hyperechoic fungal                Beckwith–Wiedemann syndrome and sporadic
balls within the dilated collecting system. Fungal               aniridia, with a 30–40% incidence in sporadic aniridia.
230    ABDOMINAL ULTRASOUND



              LT                                                         LT




          A                                                          B
      Figure 9.11 (A) The dilated collecting system of this kidney is filled with a large, rounded fungal ball of candidiasis
      infection. (B) The fungus ball is seen to disintegrate, emptying into the renal pelvis.

      The tumours are large at presentation, presenting              a large, multiloculated cystic mass. The main dif-
      with a palpable abdominal mass, and, less frequently,          ferential diagnosis would be of a mesonephric blas-
      pain, haematuria and fever. About 5% of these                  toma occurring during the first year of life and
      tumours are bilateral.20 The prognosis when unilat-            histology is required to establish the diagnosis.
      eral is generally good.                                           In most cases, an ultrasound and chest radio-
         The ultrasound appearances are of a relatively              graph are sufficient to diagnose correctly Wilms’
      well-defined heterogeneous mass, predominantly                 tumour but CT of the chest and abdomen is gen-
      solid but frequently with some necrotic or haem-               erally used for staging, and to exclude metastatic
      orrhagic areas, often almost completely replacing              disease in the chest and liver.21 Percutaneous
      the kidney (Fig. 9.12). Small focal areas of calcifi-          biopsy for confirmation of histological type is gen-
      cation are seen very occasionally. A search should             erally performed. CT or MRI is more sensitive
      be made for tumour invasion of the renal vein and              than ultrasound scanning in demonstrating small
      IVC which occurs in up to 10% of cases. Tumour                 tumours in the contralateral kidney.
      invasion may extend into the right atrium.
      Occasionally a large, right-sided Wilms’ tumour
                                                                     Xanthogranulomatous pyelonephritis
      may compress the IVC but not invade it; colour or
      power Doppler may be useful in the difficult dis-              Xanthogranulomatous pyelonephritis results from
      tinction between compression and invasion on                   chronic infection in an obstructed kidney and chil-
      ultrasound. Ultrasound also identifies associated              dren present with a history of general malaise, low-
      lymphadenopathy, particularly in the para-aortic               grade fever and flank pain and may be found to be
      and paracaval regions, and metastatic liver disease.           anaemic. The finding of a palpable abdominal mass
         In a small percentage of cases, tumour may also             on examination often leads to an early diagnosis of
      be found in the contralateral kidney. This is usually          a possible Wilms’ tumour. On sonography the kid-
      much smaller than the mass on the presenting side              ney is diffusely enlarged, with loss of the normal
      and may be acoustically subtle. Up to 7% of con-               corticomedullary differentiation. The presence of
      tralateral tumours are missed on preoperative                  calyceal dilatation with debris and calculi in the col-
      imaging due to their small size and the operator               lecting system and confirmation of urinary infec-
      must be alert to the possibility of bilateral disease.20       tion in addition to the generalized involvement of
         Occasionally a Wilms’ tumour may be found to                the kidney helps to differentiate this condition
      be predominantly cystic, having the appearances of             from Wilms’ tumour (Fig. 9.12B). Occasionally
                                                                                        THE PAEDIATRIC ABDOMEN          231




                               A

        LT




 B                                                         C
Figure 9.12 (A) Large Wilms’ tumour arising in the left kidney and filling the left flank with a solid, heterogeneous
mass. (B) Xanthogranulomatous pyelonephritis was the cause of the renal mass in this 8-year-old boy presenting with
anaemia and a flank mass. (C) Renal vein thrombosis in a dehydrated neonate, showing an enlarged ‘globular’ kidney
with loss of the normal corticomedullary differentiation.


CT scanning may also be helpful. The kidney will               Classically the sick neonate is noted to develop gross
usually be found to be non-functioning on a                    haematuria in association with a palpable abdominal
DMSA scan and nephrectomy is required.                         mass. RVT is usually unilateral but may be bilateral
                                                               and is associated with acute adrenal haemorrhage
                                                               when left-sided. Sonographically the affected kidney
Renal vein thrombosis (RVT)
                                                               is enlarged and globular and develops an inhomo-
RVT primarily occurs in the neonatal period but                geneous echogenicity of the renal parenchyma with
may occur in the older child, particularly in associa-         areas of increased echogenicity due to haemorrhage
tion with renal malignancy and amyloidosis.                    (Fig. 9.12C). Thrombus may be detected in the
232    ABDOMINAL ULTRASOUND



      ipsilateral renal vein and IVC and Doppler sonogra-     encasing vascular structures: it may be difficult to
      phy shows reduced or absent blood flow in the renal     differentiate from lymphadenopathy (Fig. 9.13B,
      vein and loss of the normal variation in the renal      C and D). Nodes tend to surround and elevate the
      vein waveform. Arterial flow is also decreased. On      aorta and IVC.
      follow-up the kidney may completely recover due to         MRI and CT are used for staging, particularly in
      the development of collateral blood flow or early       assessing retroperitoneal spread.22 Bone scintigra-
      recanalization of the renal vein, but in severe cases   phy and MIBG scans are also useful in demon-
      the kidney may atrophy and calcify.                     strating metastases.


                                                              Adrenal haemorrhage
      ADRENAL GLANDS
                                                              After birth, the bulky fetal cortex normally invo-
      Normal appearances                                      lutes. Adrenal haemorrhage occurs in the neonate
      In utero and postnatally, the adrenal glands are        as a result of trauma to the vulnerable fetal cortex
      large, about one-third the size of the kidney, and      during delivery or in association with perinatal
      composed mainly of the bulky, hypoechoic fetal          asphyxia. Haemorrhage may occur in up to 2% of
      cortex which makes up about 80% of the gland.           births.23 This may be uni- or bilateral and may
      The neonatal adrenal glands are easily demon-           cause a palpable mass and abdominal pain.
      strated on ultrasound. The bulky fetal cortex is        Ultrasound can be used to follow the resolution of
      sonographically apparent as a thick hypoechoic          the haemorrhage over a period of weeks; in the ini-
      layer surrounding the thinner, hyperechoic adre-        tial stages of haemorrhage the adrenal mass is
      nal medulla (Fig. 9.13A). The fetal cortex sur-         hyperechoic, gradually liquefying into a well-
      rounds the smaller, permanent cortex and                defined mass of mixed echo pattern and becoming
      gradually starts to involute after birth. By the age    cystic (Fig. 9.13 E, F). This may completely resolve
      of 2–4 months, the adrenal glands have attained         over a period of some weeks leaving a normal adre-
      their normal adult configuration of the thin,           nal gland or the gland may become atrophic and
      hypoechoic cortex with a tiny layer of hyperechoic      calcify. In rare cases an adrenal haemorrhage may
      adrenal medulla within.                                 progress to an abscess.24


      Neuroblastoma                                           Adrenal calcification
      The neuroblastoma is a malignant tumour arising         Calcification of the gland in babies and infants is
      in the sympathetic chain, most commonly the             usually the result of previous infection or haemor-
      adrenal medulla. The majority of neuroblastomas         rhage. Adrenal abscess cavities may calcify after
      present before the age of 4 years with a palpable       successful treatment. Gross calcification in
      abdominal mass, and many already have metas-            bilateral adrenal glands in association with
      tases at the time of presentation to the liver, bone    hepatosplenomegaly in the infant indicates the
      marrow, skin or lymph nodes. Table 9.4 lists the        likely diagnosis of Wolman’s disease, an inborn
      most frequent abdominal tumours occurring in            error of lipid metabolism that is invariably fatal.
      childhood.
         The tumour is usually large on presentation,
                                                              GASTROINTESTINAL TRACT
      displacing the kidney downwards and laterally. In
      some cases it may invade the adjacent kidney,           Bowel ultrasound in paediatrics is an established
      becoming difficult to distinguish from a Wilms’         and readily accepted investigation, replacing con-
      tumour. Neuroblastoma is predominantly solid on         trast radiology in many cases. The range of poten-
      ultrasound, having a heterogeneous texture and          tial applications continues to increase.25 Most
      frequently containing calcification. The tumour         gastrointestinal tract scanning in paediatrics is best
      margins are ill-defined and infiltrate the surround-    performed with a high-frequency (15–7.5 MHz)
      ing organs and tissues, crossing the midline and        linear or small footprint curvilinear probe.
                                                                                       THE PAEDIATRIC ABDOMEN          233




           A                                                     B




           C                                      D




      RT




  E                                                       F
Figure 9.13 (A) Normal adrenal gland in a neonate, demonstrating the bulky, hypoechoic fetal cortex surrounding the
thinner, hyperechoic medulla. (B) Left adrenal neuroblastoma. (C) Metastases were also present throughout the liver.
(D) Confirmation of the left adrenal neuroblastoma and liver metastases on CT. (E) Adrenal haemorrhage in a neonate.
(F) Same patient as in (E); 3 months later the haemorrhage has resolved and calcification has developed in the
involuted adrenal gland.
234       ABDOMINAL ULTRASOUND



                                                                    It must be stressed that the examination is
       Table 9.4 Paediatric abdominal malignancies
                                                                 dynamic and measurements of muscle thickness
       Wilms’ tumour                                             must be interpreted in conjunction with the obser-
       Neuroblastoma                                             vations of gastric peristalsis and failure of the
       Hepatoblastoma                                            pylorus to relax normally. Sensitivity and specificity
       Hepatocellular carcinoma                                  of 97% and 99% for the diagnosis of HPS have been
       Rhabdomyosarcoma                                          reported in expert hands (Fig. 9.14). If clinical sus-
       Leukaemia                                                 picion persists after a negative ultrasound, a repeat
       Lymphoma                                                  examination after 1 or 2 days may be performed to
                                                                 exclude an evolving pyloric stenosis.


      Hypertrophic pyloric stenosis (HPS)                        Intussusception
      HPS is a condition occurring in newborn infants            Intussusception is the invagination of a segment of
      commonly about 6 weeks of age when the pyloric             bowel into the lumen of the adjacent bowel. It is a
      muscle becomes hypertrophied and elongated,                common paediatric emergency, especially in
      restricting the passage of gastric contents, causing       younger children aged 3 months to 3 years, and
      projectile vomiting. Most infants with HPS are             tends to affect the ileocaecal region.
      found to have a hypochloraemic alkalosis and,                 The child presents with abdominal pain, some-
      when seen in association with a palpable epigastric        times with a palpable mass, vomiting or rectal bleed-
      mass the size of an olive on test feeding, the diag-       ing. Intussusception can result in bowel necrosis and
      nosis is clear without the need for ultrasonic imag-       subsequently perforation requiring surgery.
      ing. However, ultrasound is very successful in                The ultrasound appearances of bowel within
      demonstrating HPS in approximately 20% of                  bowel are characteristic. In cross-section, the
      infants in whom the pyloric olive cannot be pal-           bowel assumes a ‘doughnut’ configuration, with
      pated.26,27                                                concentric rings of bowel wall (Fig. 9.15). Dilated
          The baby should be positioned comfortably right        loops of fluid-filled obstructed bowel may be
      side down and the stomach and pylorus identified           demonstrated proximal to the intussusception.
      usually just to the right of the midline in the low epi-      The use of ultrasound to diagnose this condi-
      gastric region. A small feed, of approximately 20–         tion is highly reliable,30 reducing or eliminating the
      30 ml of sugared water (preferable to milk as it does      need for contrast radiology.
      not contain echoes which may obscure vital detail),           An air enema is most commonly used to reduce
      may be used to aid visualization of the gastric antrum     the intussusception using inflation pressures of up
      if the stomach is empty. A nasogastric tube may also       to 120 mmHg. Hydrostatic reduction (that is,
      be used to administer clear fluid in a controlled way      with water/saline) under fluoroscopic or ultra-
      providing that the gastric position of the tube is con-    sound control is also an accepted treatment.31
      firmed prior to injection of the fluid. A small, high-
      frequency linear or curved linear transducer is best.
          The pylorus projects into gastric lumen and is          Table 9.5 Pyloric muscle dimensions
      outlined by the fluid. HPS can be confirmed by the
      demonstration of:                                                              Normal         Hypertrophic
                                                                                     pylorus        pyloric stenosis
      ●  thickened and elongated pyloric muscle                   Pyloric length     < 15           ≥ 16
      ●  increased but ineffective peristalsis                    (mm)
      ● failure of the pylorus to relax and open                  Pyloric width      < 11           ≥ 11
         Various figures have been quoted for muscle              (mm)
                                                                  Muscle thickness   < 2.5          ≥3
      thickness in hypertrophic pyloric stenosis ranging
                                                                  (mm)
      from 2.5 to 5 mm but 3 mm is most commonly
      accepted28,29 (Table 9.5).
                                        THE PAEDIATRIC ABDOMEN            235




    A   B




C       D
            Figure 9.14 Hypertrophic pyloric stenosis.
            (A) Normal pylorus demonstrating measurement of length
            of pyloric canal and thickness of the muscle. (B) A few
            minutes later the pylorus relaxed and opened widely,
            excluding the diagnosis of hypertrophic pyloric stenosis.
            (C) Thickened and elongated pylorus of hypertrophic
            pyloric stenosis seen in longitudinal section. S represents
            a fluid-filled stomach. (D) TS view of the thickened
            pylorus. (E) Demonstrates the measurements of pyloric
            length, muscle thickness and pyloric width.




E
236    ABDOMINAL ULTRASOUND



         The main contraindications to attempting a non-         at non-surgical reduction.32 Approximately 10% of
      surgical reduction are peritonitis and free intraperi-     cases recur whether the initial intussuception was
      toneal air. A number of sonographic features have          treated surgically or non-surgically.
      been reported to be associated with a decreased suc-
      cess rate of non-surgical reduction, including a hypo-
                                                                 Midgut volvulus
      echoic rim greater than 10 mm, absent blood flow on
      colour flow Doppler sonography, or a large amount          Malrotation of the midgut occurs as a result of failure
      of fluid trapped within the intussusception, but these     of normal rotation of the small bowel during
      findings are not contraindications to a careful attempt    intrauterine development, resulting in a shortened




       A                                                            C
                                                                Figure 9.15 Intussusception. (A) The characteristic
                                                                appearance of bowel within bowel due to an
                                                                intussusception. (B) Dilated, fluid-filled loops of obstructed
                                                                bowel are seen proximal to the intussusception. (C) Air
                                                                enema; the intussusceptum is seen indenting into the
                                                                lumen of the air-filled sigmoid colon during a successful
                                                                air enema reduction (arrow).




      B
                                                                                       THE PAEDIATRIC ABDOMEN         237


mesenteric fixation of the small bowel to the               intermittent abdominal pain due to the associated
posterior abdominal wall. This predisposes the small        malposition of the mesenteric vessels and is best seen
bowel to twisting (volving) around the mesenteric           on colour Doppler sonography. The normal rela-
vascular axis, resulting in bowel obstruction and vas-      tionship of the superior mesenteric vein to the supe-
cular compromise with a risk of infarction of most of       rior mesenteric artery is reversed, with the superior
the small bowel if the volvulus is not treated quickly.     mesenteric vein lying anteriorly and/or to the left of
   Following volvulus the child presents with acute         the superior mesenteric artery.33 However this find-
pain and bile-stained vomiting. The bowel may               ing is not always present and may occasionally be
intermittently twist and untwist, resulting in              seen in normal individuals and therefore a contrast
temporary alleviation of symptoms, which may                study is required for confirmation.
make diagnosis more difficult.                                  When volvulus has occurred the vessels may be
   The definitive diagnosis is usually made fluoro-         noted to be spiralling around a bowel mass, that is,
scopically during an upper gastrointestinal contrast        the ‘whirlpool sign’34 (Fig. 9.16). Other ultrasound
study. In malrotation the duodenal jejunal flexure is       appearances include a dilated, fluid-filled obstructed
generally found to be lower and in a more medial            duodenum, although the obstructed duodenum
position than is normal and if a volvulus has occurred      may be gas-filled, obscuring visualization. This sign
a corkscrew appearance of the volved small bowel            is not invariable, however, and a contrast study may
may be seen (Fig. 9.16). The proximal duodenum              still be needed to confirm or exclude the diagnosis of
will be dilated secondary to the duodenal obstruc-          a midgut volvulus. Surgery is performed to untwist
tion.                                                       the bowel, which is then laid carefully in the cor-
   Malrotation without volvulus may be suspected            rect position; attachment is usually unnecessary, as
during a sonographic examination performed for              abdominal adhesions tend to stabilize the bowel.




    TS




A                                                           B
Figure 9.16 Volvulus. (A) Mesentery and superior mesenteric vein are twisted around the superior mesenteric artery,
which is seen in cross-section at the centre of the film. (B) Barium meal shows corkscrewing of the duodenum away
from the midline, consistent with a malrotation and volvulus. (By kind permission of Dr Delia Martinez, Leeds.)
238    ABDOMINAL ULTRASOUND



      Gastro-oesophageal reflux                                     Appendicitis
      Reflux through the gastro-oesophageal hiatus is a             Ultrasound is the first line of investigation for the
      common problem associated with neonatal vomit-                child presenting with acute abdominal pain, where
      ing, leading to oesophagitis. The diagnosis is usually        the diagnosis is uncertain following clinical assess-
      made with a contrast meal, PH probe and isotope               ment. The position of the appendix in small children
      milk scan. Reflux can be observed on ultrasound as            may vary—pointing upwards, downwards or to the
      the retrograde flow of stomach contents through               patient’s left—making the clinical diagnosis difficult,
      the hiatus and up the oesophagus.                             as the pain is not always confined to the right lower
         The normal intra-abdominal segment of the                  quadrant. Ultrasound is particularly useful in estab-
      oesophagus can be demonstrated through the left               lishing the diagnosis of acute appendicitis and in
      lobe of the liver, is usually between 2 and 3 cm              diagnosing other possible causes of acute abdominal
      long, and makes an acute angle with the gastric               pain, such as gynaecological disorders.35,36 It is always
      wall. When episodes of reflux are seen over three             good practice to perform a full abdominal survey
      times in 10 minutes, this is said to be pathological.         when the clinical presentation is indeterminate.




       A                                                        B
                        LS                                       TS




                       C                                        D
      Figure 9.17 Appendicitis. (A) The normal appendix (arrows) lying transversely across the psoas muscle. (B)
      Longitudinal scan through dilated inflamed appendix containing appendicolith. (C) Dilated thick-walled appendix seen
      in LS. (D) Same patient as (C) where appendix is seen in cross-section surrounded by echogenic oedematous mesentery,
      with dilated fluid-filled caecum seen just laterally.
                                                                                                                   (Continued)
                                                                                         THE PAEDIATRIC ABDOMEN          239




                        E




                    F                                      G
Figure 9.17 cont’d (E) Increased vascularity of inflamed appendix seen on colour flow Doppler imaging. (F) Walled
off appendix abscess containing fluid and gas. (G) Complex inflammatory mass containing appendicolith.


   Ultrasound demonstrates a hypoechoic, thick-                finding and is not a reliable indicator of an acute
ened appendix, > 6 mm thick, with a blind end (Fig.            abdomen. If echogenic fluid is seen, this is sugges-
9.17). Occasionally an appendicolith, with strong              tive of intraperitoneal infection in the child with
acoustic shadowing, is present. The inflamed appen-            acute abdominal pain, but may be seen in other
dix is not compressible on gentle, graded compres-             conditions, for example rupture of a haemorrhagic
sion with the transducer. This should be done very             ovarian cyst. If ultrasound is equivocal, the clini-
carefully, and released very slowly to avoid rebound           cians may decide to observe the child but further
tenderness. Ultrasound cannot reliably exclude                 imaging with CT scanning can be helpful in a few
appendicitis, especially if the appendix is retrocaecal.       selective cases. Alternatively a laparoscopic exami-
   Perforation may not be easy to see with ultra-              nation may be performed where there is significant
sound, as fluid may disperse through the abdomen               clinical concern37.
with decompression of the appendix itself.
However, a frank periappendiceal fluid collection
                                                               Enteric duplication cysts
or abscess is easily demonstrable in a proportion of
children and may, in some cases, be treated conser-            These comparatively rare lesions present in infancy or
vatively with antibiotics or drained percutaneously            early childhood with nausea, gastrointestinal bleed-
prior to surgery. The presence of free fluid, partic-          ing, intestinal obstruction and, occasionally, a palpa-
ularly if clear, in the abdomen is a non-specific              ble mass. Most are intra-abdominal but oesophageal
240    ABDOMINAL ULTRASOUND




                 A                                                B
      Figure 9.18 (A) Duplication cyst with thickened wall adjacent to bowel. (B) Typical ‘double’ wall seen in enteric
      duplication cysts.

                                                                      hyperechoic, sometimes with gravity-dependent
       Table 9.6 Abdominal fluid-filled masses in
       paediatrics—differential diagnoses                             debris or blood.38
                                                                         The wall is well defined and a hyperechoic inner
       Choledochal cyst                                               rim of mucosa may be identified in some cases of
       Mesenteric cyst                                                intestinal duplication (Fig. 9.18). The cyst is
       Duplication cyst                                               closely related to the adjacent bowel and this can
       Hepatic cyst                                                   be appreciated on real-time scanning as the bowel
       Pancreatic pseudocyst                                          peristalses. CT and MRI rarely add anything to the
       Epidermoid cyst of the spleen                                  ultrasound information. Contrast radiography may
       Lymphangioma                                                   show an extrinsic defect but communication with
       Ovarian cyst                                                   the cyst is rare.
       Encysted fluid associated with ventriculoperitoneal
                                                                         There are many causes of intra-abdominal cystic
         shunt tubing
       Renal cyst or renal dilatation
                                                                      masses in children. (Table 10.6). The main differ-
       Cystic renal tumour                                            ential diagnosis in the infant girl is from an ovarian
                                                                      cyst as the ovary is generally an intra-abdominal
                                                                      organ at this age. Useful indicators of an ovarian
                                                                      origin can be detected on careful sonography, by
      duplication cysts cause a thoracic lesion with respira-         detecting some residual ovarian tissue in the cyst
      tory symptoms. Multiple cysts may be present.                   wall, and the finding of a clearly seen multifollicu-
         The fluid-filled lesion may demonstrate a spec-              lar ovary on one side with absent visualization of a
      trum of ultrasonic appearances, from anechoic to                definite ovary on the other side.

      References
       1. McHugo JM, McKeown C, Brown MT et al. 1987                      disease in cystic fibrosis as part of an annual
          Ultrasound findings in children with cystic fibrosis.           assessment clinic: a 9-year review. Clinical Radiology
          British Journal of Radiology 60: 137–141.                       57: 365–370.
       2. Williams SM, Goodman R, Thompson A, Mchugh K,                3. Wilson-Sharpe RC, Irving HC, Brown RC et al. 1984
          Lindsell DRM. 2002 Ultrasound evaluation of liver               Ultrasonography of the pancreas, liver and biliary
                                                                                            THE PAEDIATRIC ABDOMEN            241


      system in cystic fibrosis. Archives of Diseases of        19. Dacher JN, Pfister C, Monroc M, Eurin D, Ledosseur
      Childhood 59: 923–926.                                        P. 1996 Power Doppler sonographic pattern of acute
 4.   McEvoy CF, Suchy FJ. 1996 Biliary tract disease in            pyelonephritis in children: comparison with CT.
      children. Pediatric Gastroenterology 43: 75–98.               American Journal of Roentgenology 166: 1451–1455.
 5.   Farrant P, Meire HB, Mieli-Vergani G. 2000                20. Ritchey ML, Green DM, Breslow NB et al. 1995
      Ultrasound features of the gallbladder in infants             Accuracy of current imaging modalities in the
      presenting with conjugated hyperbilirubinaemia.               diagnosis of synchronous bilateral Wilms’ tumour: a
      British Journal of Radiology 73: 1154–1158.                   report from the National Wilms’ Tumour Study
 6.   Kim SH, Lim JH, Yoon HK et al. 2000 Choledochal               Group. Cancer 75: 600–604.
      cyst: comparison of MR and conventional                   21. Scott D J, Wallace WHB, Hendry GMA. 1999 With
      cholangiography. Clinical Radiology 55 (5): 378–383.          advances in medical imaging can the radiologist
 7.   Siegel MJ. 2002 Gallbladder and biliary tract. In:            reliably diagnose Wilms’ tumours? Clinical Radiology
      Siegel M (ed.) Pediatric Sonography. Lippincott               54: 321–327.
      Williams & Wilkins, Philadelphia, pp. 275–304.            22. Abramson SJ. 1997 Adrenal neoplasms in children.
 8.   Takano H, Smith WL. 1997 Gastrointestinal tumors              Radiologic Clinics of North America 35 (6):
      of childhood. Radiologic Clinics of North America             1415–1453.
      35: 1367–1389.                                            23. Felc Z. 1995 Ultrasound in screening for neonatal
 9.   Buetow PC, Rao P, Marshall WH. 1997 Imaging of                adrenal haemorrhage. American Journal of Perinatology
      paediatric liver tumours. Magnetic Resonance                  12: 363–366.
      Imaging Clinics of North America 5: 397–413.              24. Steffens J, Zaubitzer T, Kirsch W, Humke U. 1997
10.   Boon LM, Burrows PE, Patiel HJ et al. 1996                    Neonatal adrenal abscesses. European Journal of
      Hepatic vascular anomalies in infancy: a twenty-seven         Urology 31: 347–349.
      year experience. Journal of Paediatrics 129:              25. John SD. 1999 Trends in pediatric emergency
      3346–3354.                                                    imaging. Radiologic Clinics of North America 37:
11.   Siegel MJ, Martin KW, Worthington JL. 1987                    995–1007.
      Normal and abnormal pancreas in children: US              26. Godbole P, Sprigg A, Dickson JAS, Lin PC. 1996
      studies. Radiology 165: 15–18.                                Ultrasound compared with clinical examination in
12.   Han BK, Babcock DS. 1985 Sonographic                          infantile hypertrophic pyloric stenosis. Archives of
      measurements and appearances of normal kidneys in             Diseases of Childhood 75: 335–337.
      children. American Journal of Roentgenology 145:          27. Morrison SC. 1997 Controversies in abdominal
      611–616.                                                      imaging. Pediatric Clinics of North America 44:
13.   Ferrer FA, McKenna PH, Bauer B, Miller SF. 1997               555–574.
      Accuracy of renal ultrasound measurements for             28. Stunden RJ, LeQuesne GW, Little KE. 1986 The
      predicting actual kidney size. Journal of Urology 157:        improved ultrasound diagnosis of hypertrophic pyloric
      2278–2281.                                                    stenosis. Pediatric Radiology 16: 200–205.
14.   Bisset GS, Strife JL. 1987 The duplex collecting          29. O’Keefe FN, Stansberry SD, Swischuk LE et al. 1991
      system in girls with urinary tract infection prevalence       Antropyloric muscle thickness at ultrasound in infants:
      and significance. American Journal of Roentgenology           what is normal? Radiology 187: 827–830.
      148: 497–500.                                             30. Verschelden P, Filiatrault D, Garel L et al. 1992
15.   Assael BM, Guez S, Marra G et al. 1998 Congenital             Intussusception in children: reliability of US in
      reflux nephropathy: a follow-up of 108 cases                  diagnosis – a prospective study. Pediatric Radiology
      diagnosed perinatally. British Journal of Urology 82:         184: 741–744.
      252–257.                                                  31. Chan KL, Saing H, Peh WCG et al. 1997 Childhood
16.   Tibballs JM, De Bruyn R. 1996 Primary                         intussusception: ultrasound-guided Hartmann’s
      vesicoureteric reflux: how useful is postnatal                solution, hydrostatic reduction or barium enema
      ultrasound? Archives of Diseases of Childhood 75:             reduction? Journal of Pediatric Surgery 32: 3–6.
      444–478.                                                  32. Britton I, Wilkinson AG. 1999 Ultrasound features of
17.   Zerin JM, Ritchey ML, Chang CCH. 1993 Incidental              intussusception predicting outcome of air enema.
      vesicoureteral reflux in neonates with antenatally            Pediatric Radiology 29: 705–710.
      detected hydronephrosis and other renal                   33. Zerin JM, DiPietro MA. 1992 Superior mesenteric
      abnormalities. Radiology 187: 157–160.                        vascular anatomy at US in patients with surgically
18.   Mackenzie S. 2001 Radiological investigation of               proved malrotation of the midgut. Radiology 183:
      paediatric UTI. Imaging 13(4): 285–294.                       693–694.
242    ABDOMINAL ULTRASOUND


      34. Pracros P, Sann L, Genin G et al. 1992 Ultrasound       37. Quillan SP, Siegel MJ, Coffin CM. 1992 Acute
          diagnosis of midgut volvulus: the ‘whirlpool’ sign.         appendicitis in children: value of sonography in
          Pediatric Radiology 22: 18–20.                              detecting perforation. American Journal of
      35. Siegal MJ. 1995 Appendicitis in childhood:                  Roentgenology 159: 1265–1268.
          usefullness of ultrasound in diagnosis. Paediatric      38. Segal SR, Sherman NH, Rosenberg HK et al.
          Surgery International 10: 62–67.                            1994 Ultrasonic features of gastrointestinal
      36. Pena BM, Taylor GA, Fishman SJ et al. 2002 Effect           duplications. Journal of Ultrasound in Medicine 13:
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          pediatric patients with appendicitis. Pediatrics 110:
          1088–1093.

      General reading
      1.   Carty H, Brunelle F, Shaw D, Kendall B. 1994           3.   Stringer DA, Babyn PS. 2000 Pediatric Gastrointestinal
           Imaging Children. Churchill Livingstone, Edinburgh.         Imaging and Intervention. BC Decker, Ontario.
      2.   Siegel MJ. 2002 Pediatric Sonography, 3rd edn.
           Lippincott/Williams & Wilkins, Philadelphia.
                                                                                                  243

Chapter       10

The acute abdomen



                                        Ultrasound has an increasingly important role in
CHAPTER CONTENTS                        the initial evaluation of the acute abdomen. Many
                                        trauma centres recognize the value of ultrasound as
Trauma 244
                                        a first-line investigation in properly trained hands.
Gastrointestinal tract 245
                                        Small portable scanners now offer bedside—even
Hepatobiliary emergencies 246
                                        roadside—assessment that can speed the triage
The acute pancreas 248
                                        process, whereas higher-specification scanners
Renal tract emergencies 248
                                        enable the experienced operator to diagnose
Other retroperitoneal emergencies 248
                                        detailed pathology in the acute abdomen. CT also
                                        has an increasing role in this situation. It is readily
                                        available in most centres and is proven to be highly
                                        accurate. But CT is static, takes longer to arrange
                                        and perform and is not always possible, particularly
                                        in acutely ill and unstable patients.
                                           There is little doubt that the accuracy of the
                                        ultrasound scan is directly attributable to the skill
                                        and experience of the operator.1 For instance, a
                                        detailed knowledge of the anatomy, and therefore
                                        potential communications, of the peritoneal and
                                        retroperitoneal fascial spaces is essential in order to
                                        understand the significance and likely origin of an
                                        abdominal fluid collection. A left iliac fluid collec-
                                        tion may simply be due to local causes such as a
                                        diverticular abscess, but could be the result of fluid
                                        tracking from a leaking aortic aneurysm or an
                                        acutely inflamed or ruptured pancreas.
                                           One other significant advantage of ultrasound is
                                        that it is usually an ‘interactive’ process. In the
                                        acute setting, the simple question ‘Where does it
                                        hurt?’ will frequently direct the operator to the
                                        underlying pathology, for example in acute bowel
                                        inflammation or acute cholecystitis. Clinical signs,
                                        such as erythema ab igne, which results from pain
                                        relief by the patient applying a hot water bottle to
244    ABDOMINAL ULTRASOUND



      the symptomatic area, may also help to focus the         varying success. These include rupture of the
      examination. The operator should be alert to             liver, spleen, kidney, pancreas or bowel (Fig. 10.1).
      potential clues and be prepared to step outside          A notable limitation of sonography in the trauma
      standard scanning protocols, adapting to the many        situation is in detecting free fluid in the pelvis, as
      possible presentations of trauma or other acute          the bladder is frequently empty or underfilled, and
      abdominal conditions.                                    the use of the Trendelenburg position, if possible,
         Although many of the following conditions are         helps to reduce the number of false-negative results
      dealt with in other relevant chapters, together with     in this respect by allowing any free fluid to collect
      details of the respective ultrasound appearances,        in the pelvis under the influence of gravity.
      there are issues that are specific to the patient who    Ultrasound is more successful in detecting free
      presents acutely.                                        fluid than in detecting organ injury directly.6,7 One
                                                               study reported a 98% sensitivity for detection of
                                                               fluid, but only 41% of organ injuries could be
      TRAUMA
                                                               demonstrated.8 However, most of the published
      Blunt or penetrating trauma to the torso, fre-           studies have concentrated only on the presence or
      quently due to a road traffic accident (RTA) or          absence of free fluid, rather than the comprehen-
      other forms of accident or violence, is a frequent       sive assessment of the abdomen by suitably quali-
      cause of referral to most accident and emergency         fied sonographers. The presence of free fluid on
      departments, and forms the main indication for           ultrasound in a trauma situation therefore infers
      trauma ultrasound. Internal organ injury as a result     organ injury requiring careful ultrasonic assess-
      of trauma is extremely difficult to assess clinically,   ment, further investigation with CT or direct refer-
      especially as many patients are admitted uncon-          ral for surgery depending on the state of the
      scious or in a highly unstable condition. Such           patient.
      trauma patients may require emergency laparo-               Direct visualization of organ rupture is difficult
      tomy and ultrasound has been shown to be an              unless a haematoma or other collection is seen.
      invaluable tool in the triage process.2,3 This may be    Laceration or contusion may be demonstrated in
      accompanied by CT, which has the advantage of            the liver, kidneys or spleen, but less easily in
      being able to recognize other injuries which may         the pancreas and very infrequently in the bowel.
      be present, such as bony, spinal or retroperitoneal      A subtle change in texture may be observed by the
      trauma which may or may not be accessible to             experienced operator, or a fine, high-reflectivity
      ultrasound investigation.                                linear band representing an organ tear. A delayed
         A system of scanning known as FAST (focused           scan may demonstrate more obvious organ injury
      assessment with sonography for trauma) has               than that apparent on an immediate post-trauma
      recently become widely adopted in trauma centres.        examination. Small visceral lacerations not visible
      This system depends upon the proper training of          on ultrasound may become apparent when imaged
      appropriate personnel, and a number of standard-         with CT. In particular, pancreatic damage (often
      ized training and accreditation programmes have          due to the sudden pressure of a seat belt across the
      been devised, notably by the American College of         abdomen during road accidents) may not be obvi-
      Emergency Physicians.4 FAST scanning involves a          ous immediately post-trauma on either ultrasound
      minimum four-view examination, principally to            or CT.9 Damage to the pancreatic duct (Fig. 10.1E)
      detect the presence of fluid which may result from       causes leakage of pancreatic fluid into the abdomi-
      the rupture of internal organs. The four-view scan       nal cavity, resulting in pancreatitis and possible
      should include the right and left flanks (for hepa-      pseudocyst formation or peritonitis.
      torenal space, perisplenic regions and spaces above         Free fluid may be present as the result of vessel,
      and below the diaphragm), the subcostal region           rather than organ, rupture. A reduction or loss of
      (to include the pericardial space) and the pelvis        blood flow to all or part of the relevant organ, for
      (retrovesical and retrouterine spaces).5                 example the kidney, may be demonstrated using
         Free fluid is associated with numerous types of       colour and power Doppler ultrasound. The finding
      injury, which may be detected on ultrasound with         of free fluid in women should prompt a detailed
                                                                                               THE ACUTE ABDOMEN            245


scan of the pelvis where possible. Gynaecological
                                                              GASTROINTESTINAL TRACT
masses may rupture or haemorrhage, presenting
acutely, and in women of childbearing age, ectopic            Most acute presentations of gastrointestinal tract
pregnancy should be included in the list of differ-           pathology are due to obstruction or inflammation,
ential diagnoses.                                             and the ultrasound appearances of these conditions
   When visceral trauma is treated conservatively,            are discussed more fully in Chapter 8. Appendicitis,
follow-up ultrasound may be used to monitor the               and its possible complications, is one of the most
resolution of any fluid collections or haematoma.             common reasons for referral (Fig. 10.2). Ultrasound




               A




                                                    B




         C




                                                                        D
Figure 10.1 (A) The presence of free fluid in a trauma patient implies organ injury, even if this cannot be successfully
demonstrated on ultrasound. CT on this patient demonstrated perforation of the bowel. (B) A patient who has been
stabbed on the right side has injury to the liver causing a subcapsular haematoma. Blood is also present in the right
chest. (C) Laceration of the spleen following a road traffic accident. Free fluid was also present in the abdomen.
(D) Splenic lacerations are more obvious several hours after injury. This large splenic haematoma resolved following
conservative treatment.
                                                                                                              (Continued)
246    ABDOMINAL ULTRASOUND



                                                                  linear probe, many useful indicators can be found
                                                                  with the basic curvilinear or sector abdominal scan.
                                                                  The presence of fluid-filled bowel segments, which
                                                                  may also show ‘overactive’ peristalsis, should alert
                                                                  the operator to the possibility of acute intestinal
                                                                  obstruction. Such segments frequently lie proximal
                                                                  to the obstructing lesion, and so the point at which
                                                                  they appear to end should be the subject of
                                                                  detailed examination. Ultrasound is highly accu-
                                                                  rate in demonstrating obstruction. However, it is
                                                                  less successful in finding its cause and contrast CT
                                                                  or other bowel studies are usually undertaken
                                                                  when obstruction is diagnosed. With both intes-
                                                                  tinal obstruction and focal pain it may be necessary
                                                                  to examine the hernial orifices. A small but symp-
                                                                  tomatic epigastric hernia often goes unnoticed
                                                                  unless a detailed scan of the abdominal wall is
                                                                  performed.
                                                                     Fluid collections such as abscesses may also
      E
                                                                  point to the diseased segment, for example in
      Figure 10.1 cont’d (E) CT demonstrating pancreatic
                                                                  Crohn’s disease or acute diverticulitis. Such inflam-
      fracture (arrow) in the tail of the pancreas following a
                                                                  matory bowel conditions may well present with an
      road traffic accident. Ultrasound was not able to
      demonstrate the fracture but did demonstrate free fluid     established history which helps the operator to
      following the accident and also diagnosed                   focus the ultrasound examination accordingly.
      devascularization of the left kidney (no Doppler flow          Perforation of an abdominal viscus can produce
      within the kidney) following a severed left renal artery.   small amounts of ascites. This is usually ‘mucky’,
      This is also confirmed on CT.                               i.e. containing particulate or gas bubble echoes,
                                                                  and may be localized close to the perforation site,
                                                                  around the duodenum or within the lesser sac.
                                                                  Although gas is usually regarded as an obstacle to
                                                                  ultrasound diagnosis, recent studies have shown
                                                                  that specific patterns of gas echoes can make ultra-
                                                                  sound more sensitive than plain radiography in the
                                                                  diagnosis of pneumoperitoneum.10

                                                                  HEPATOBILIARY EMERGENCIES
                                                                  Ultrasound scanning is invariably the first-line
                                                                  investigation for suspected biliary tract emergen-
                                                                  cies. These include inflammatory conditions caus-
                                                                  ing right upper quadrant and epigastric pain,
                                                                  mostly acute cholecystitis or gallstone pancreatitis,
      Figure 10.2   Appendicitis abscess.                         and the various causes of obstructive jaundice
                                                                  (Fig. 10.3). If possible, interventional treatment
      has a high sensitivity for acute appendicitis, partic-      should be delayed until a detailed imaging assess-
      ularly in children.                                         ment of the cause of biliary obstruction has been
         Although the detailed assessment of the primary          made, since the presence of a biliary stent can
      gastrointestinal pathology usually requires evaluation      compromise subsequent imaging by CT, MRI or
      by an experienced operator with a high-frequency            endoscopic ultrasound. Similarly, biliary stents
                                                                                               THE ACUTE ABDOMEN        247



                                 LIVER   LS GB
                                                               STENT RUQ




            A                                                  B




                   C                                           D
Figure 10.3 (A) An acutely tender, inflamed gallbladder containing stones and debris. (B) A patient with known
carcinoma of the head of the pancreas has presented acutely with obstructive jaundice. Her stent (arrow) is blocked,
causing intrahepatic biliary duct dilatation with cholangitis (C). (D) Large liver abscess in an acutely ill patient.



frequently cause bile duct wall thickening and may            patients may be poor operative risks12 and in cases
introduce gas into the biliary tree. These will pre-          of stone-related cholangitis.
vent the diagnosis of cholangitis or ductal calculi              Ultrasound-guided bed-side cholecystostomy
with ultrasound, and may impede detailed Doppler              may also be useful in high-risk patients with
investigation of, for example, the portal vein. If            infected gallbladders and is an effective treatment
urgent biliary drainage is required, particularly             for acalculous cholecystitis brought on by pro-
when the bile is infected, this can quickly be                longed postoperative fasting.
effected by endoscopic stent placement or sphinc-                The liver itself may be acutely tender in systemic
terotomy.11 These less invasive methods are replac-           venous congestion due to cardiac failure, acute
ing surgery as the treatment of choice in this                hepatitis, or the presence of an intrahepatic
situation, having a lower mortality rate. Endo-               abscess. The management of liver abscesses is
scopic sphincterotomy and stone extraction have               determined by their size, number and cause.
been found to be preferable to surgery, particularly          Ultrasound is used to guide diagnostic aspiration
in cases of severe gallstone pancreatitis where               and drainage procedures, and most types of hepatic
248    ABDOMINAL ULTRASOUND



      abscess can be treated successfully using these tech-    tations include renal vein thrombosis or sponta-
      niques combined with appropriate antibiotic              neous haemorrhage, usually from a renal tumour
      therapy.                                                 or cyst.
                                                                  Until recently, ultrasound and/or intravenous
                                                               urography (IVU) have been the investigations of
      THE ACUTE PANCREAS
                                                               choice in acute renal colic due to suspected ureteric
      (See also Chapter 5.) Most cases of acute pancreati-     calculus, and in most UK centres the IVU is cur-
      tis are suspected clinically, with raised amylase lev-   rently the method of choice for demonstrating
      els and often a history of recurrent epigastric pain     ureteric obstruction (Fig. 10.5E). Low-dose
      pointing to the diagnosis of acute pancreatitis (Fig.    unenhanced multislice CT is increasingly being
      10.4). Although pancreatitis may be due to               recommended as a replacement for these two
      abdominal trauma, it is more frequently due to           modalities,14 but even with this technique diagnos-
      gallstone obstruction or alcohol abuse. The pan-         tic pitfalls exist.15 Abdominal ultrasound with or
      creas often appears normal even when acutely             without plain radiography may still provide com-
      inflamed, so ultrasound examination should focus         parable accuracy where CT resources are lim-
      on the possible causes (such as gallstones, biliary      ited.16,17
      dilatation or evidence of alcoholic liver disease) and      The main limitation of ultrasound in acute
      complications (pseudocysts, portal or splenic vein       ureteric obstruction is that obstruction may be
      thrombosis). Many pancreatic pseudocysts are now         present in the early stages without collecting sys-
      managed successfully by endoscopic ultrasound-           tem dilatation. But the minimally dilated renal
      guided transgastric drainage.13                          pelvis, which would normally be dismissed as unre-
                                                               markable in a patient with a full bladder, should
                                                               raise the operator’s suspicion in the patient with
      RENAL TRACT EMERGENCIES
                                                               acute loin pain. Doppler ultrasound of the kidneys
      (See also Chapter 7.) Ultrasound is usually the first-   shows a higher resistance index in the obstructed
      line investigation in the assessment of acute loin       kidney than in the normal side.18 Upper tract
      pain, which in the absence of trauma is commonly         obstruction can be relieved via cystoscopy-guided
      due to acute urinary tract obstruction and/or renal      ureteric stent placement. Ultrasound-guided per-
      infection (Fig. 10.5). Less common acute presen-         cutaneous nephrostomy may be required if this is
                                                               not practicable, or if there is evidence of infection.
                                                                  Renal infection with parenchymal involvement
                                                               (acute pyelonephritis) may be the cause of severe
                                                               acute loin pain with fever, but ultrasound examina-
                                                               tion mostly shows no abnormality. Occasionally
                                                               the skilled operator using high-specification equip-
                                                               ment may be able to identify segmental areas of
                                                               high reflectivity, showing decreased blood flow
                                                               with power Doppler. The diagnosis of this con-
                                                               dition is usually based on clinical criteria, but
                                                               these segments can be demonstrated with CT if
                                                               necessary.


                                                               OTHER RETROPERITONEAL EMERGENCIES
                                                               (See also Chapter 8.) Ultrasound has an established
                                                               role in identifying the presence of an abdominal
      Figure 10.4 Pancreatitis with a large pseudocyst. The    aortic aneurysm, but should not be used to assess
      patient was acutely tender, and the cyst was drained     subacute leakage or rupture. However, where rup-
      under ultrasound guidance.                               ture is suspected, and no previous imaging results
                                                                                                  THE ACUTE ABDOMEN           249




                                                              D




  A




                             RT




  B




  C                                                           E
Figure 10.5 (A) Obstructed kidney with pelvicalyceal system (PCS) dilatation and a dilated upper ureter. (B) Mobile
stones were demonstrated in the bladder, but the level of obstruction in the ureter could not be positively identified.
Intravenous urogram (IVU) confirmed a stone in the ureter. (C) Severe laceration to the liver following a road traffic
accident. (D) The same patient’s CT scan confirms the liver injury and demonstrates an avascular right kidney
(compared with the normal left kidney (LK)) due to laceration of the renal vessels. (E) Acute renal colic. IVU demonstrates
a left hydronephrosis with a stone in the lower ureter. (This area is not usually demonstrable with ultrasound.)
250    ABDOMINAL ULTRASOUND



      are available, ultrasound can be a time-saving triage
      tool to exclude an aneurysm from the differential
      diagnosis of abdominal pain. Suitably trained                    SAG RT
      emergency department clinical staff can perform
      this quickly and successfully.19 Rupture of an aortic
      aneurysm is a catastrophic event, and although an
      urgent contrast-enhanced CT can be helpful,
      emergency surgery based on clinical findings
      should not be delayed by imaging investigations.
         Ultrasound is also the first investigation of
      choice for demonstrating suspected psoas abscess
      or haematoma20 (Fig. 10.6).




                                                                  Figure 10.6    A large, right-sided psoas haematoma.




      References
       1. Forster R, Pillasch J, Zielke A. 1993 Ultrasonography    9. Craig MH, Talton DS, Hauser CJ, Poole GV. 1995
          in blunt abdominal trauma: influence of the inves-          Pancreatic injuries from blunt trauma. American
          tigator’s experience. Journal of Trauma 34: 264–269.        Surgeon 61: 125–128.
       2. Porter RS, Nester BA, Dalsey WC et al. 1997 Use of      10. Chen SC, Wang HP, Chen WJ et al. 2002 Selective
          ultrasound to determine the need for laparotomy in          use of ultrasonography for the detection of
          trauma patients. Annals of Emergency Medicine 29:           pneumoperitoneum. Academic Emergency Medicine
          323–330.                                                    9: 643–645.
       3. McGahan JP, Rose J, Coates TL et al. 1997 Use of        11. Lameris JS, Van-Overhagen H. 1995 Imaging and
          ultrasonography in the patient with acute abdominal         intervention in patients with acute right upper
          trauma. Journal of Ultrasound in Medicine 16:               quadrant disease. Baillière’s Clinical Gastroenterology
          653–662.                                                    9: 21–36.
       4. American College of Emergency Physicians. 1997 Use      12. Cohen SA, Siegel JH. 1995 Biliary tract emergencies:
          of ultrasound imaging by emergency physicians               endoscopic and medical management. Critical Care
          [policy statement]. Annals of Emergency Medicine            Clinics 11: 273–294.
          30: 364–365.                                            13. Norton ID, Clain JE, Wiersema MJ et al. 2001
       5. Scalea TM, Rodriguez A, Chiu WC et al. 1999                 Utility of endoscopic ultrasonography in endoscopic
          Focused assessment with sonography for trauma               drainage of pancreatic pseudocysts in selected
          (FAST): results from an international consensus             patients. Mayo Clinic Proceedings 76: 794–798.
          conference. Journal of Trauma-Injury, Infection and     14. Tack D, Sourtzis S, Delpierre I, de Maertelaer V,
          Critical Care 46: 466–472.                                  Gevenois PA. 2003 Low-dose unenhanced
       6. Bode PJ, Neizen RA, Van Vugt AB. 1993 Abdominal             multidetector CT of patients with suspected renal colic.
          ultrasound as a reliable indicator for conclusive           American Journal of Roentgenology 180: 305–311.
          laparotomy in blunt abdominal trauma. Journal of        15. Colistro R, Torreggiani WC, Lyburn ID et al. 2002
          Trauma 34: 27–31.                                           Unenhanced helical CT in the investigation of acute
       7. Lentz KA, McKenney MG, Nunez DB et al. 1996                 flank pain. Clinical Radiology 57: 435–441.
          Evaluating blunt abdominal trauma. Journal of           16. Catalano O, Nunziata A, Altei F, Siani A. 2002
          Ultrasound in Medicine 15: 447–451.                         Suspected ureteral colic: primary helical CT versus
       8. Rothlin MA, Naf R, Amgwerd M. 1993 Ultrasound               selective helical CT after unenhanced radiography and
          in blunt abdominal and thoracic trauma. Journal of          sonography. American Journal of Roentgenology 178:
          Trauma 34: 488–495.                                         379–387.
                                                                                             THE ACUTE ABDOMEN          251


17. Patlas M, Farkas A, Fisher D et al. 2001 Ultrasound      19. Kuhn M, Bonnin RL, Davey MJ et al. 2000
    vs CT for the detection of ureteric stones in patients       Emergency department ultrasound scanning for
    with renal colic. British Journal of Radiology 74:           abdominal aortic aneurysm: accessible, accurate, and
    901–904.                                                     advantageous. Annals of Emergency Medicine 36:
18. Rodgers PM, Bates JA, Irving HC. 1992 Intrarenal             219–223.
    Doppler ultrasound studies in normal and acutely         20. Monnier-Cholley L, Arrive L, Taboury J et al. 1996
    obstructed kidneys. British Journal of Radiology 65:         Non-vascular retroperitoneal emergencies. Annales de
    207–212.                                                     Radiologie 39: 72–77.
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                                                                                                            253

Chapter        11

Interventional and other
techniques


                                                 The development of ultrasound-guided minimally
CHAPTER CONTENTS                                 invasive procedures, incorporating diagnostic
                                                 biopsy, therapeutic drainage and treatment tech-
Ultrasound-guided biopsy: general
                                                 niques, has developed significantly over the last
   considerations 253
                                                 decade and is now accepted practice, in many cir-
   Analgesia 254
                                                 cumstances being used in isolation as a definitive
   Methods of ultrasound guidance 255
                                                 treatment, and in others in conjunction with other
Ultrasound-guided biopsy procedures 257
                                                 radiological or surgical options. These minimally
   Complications of ultrasound-guided
                                                 invasive methods are advantageous, with lower
   biopsy 261
                                                 patient mortality and morbidity, increased patient
Ultrasound-guided drainage 261
                                                 acceptability, and are economically beneficial.
Intraoperative ultrasound 264
                                                    The relative speed and ease with which these
Laparoscopic ultrasound 265
                                                 procedures can be carried out have resulted in a
Ultrasound contrast agents in the
                                                 reduction of the diagnostic laparotomy and more
   abdomen 266
                                                 prompt and appropriate patient treatment. Whilst
The treatment of primary and secondary hepatic
                                                 both ultrasound and CT may be used for many of
   tumours by percutaneous methods 268
                                                 these procedures, in general, ultrasound is often
Endoscopic ultrasound 269
                                                 the first-line method as it is effective in the vast
                                                 majority, generally more accessible, and does not
                                                 carry a radiation risk. Clearly, the choice of tech-
                                                 nique will depend upon the experience of the indi-
                                                 vidual, machine availability and the site and depth
                                                 of the lesion.


                                                 ULTRASOUND-GUIDED BIOPSY: GENERAL
                                                 CONSIDERATIONS
                                                 Percutaneous biopsy of organs, masses or focal vis-
                                                 ceral lesions is an integral part of the diagnostic
                                                 process for a large number of patients. Although
                                                 changes on ultrasound may confirm the suspected
                                                 clinical suspicion, that is, a bright liver may indicate
                                                 fatty change, a nodular liver may suggest cirrhosis
                                                 or enlarged kidneys of increased echogenicity may
254       ABDOMINAL ULTRASOUND



      suggest glomerulonephritis, imaging alone is not         ●   Careful explanation of the procedure to the
      enough and a definitive histological diagnosis is            patient, including risks and benefits.
      required. The advantages of using ultrasound to          ●   Informed, written consent for the procedure.
      guide such procedures are numerous:
                                                               ●   Procedure should be performed in a quiet and
      ●    The needle tip is directed, in real time, along         clean environment. Appropriate measures
           the biopsy path and visualized within the lesion.       should be taken to preserve pre-, peri- and
      ●    Greater precision is obtained; needle guidance          postprocedure sterility.
           is essential for all small lesions and lesions at   ●   A prebiopsy scan to identify a suitable biopsy
           depth.                                                  route avoiding vital structures.
      ●    Fewer needle passes are required to obtain the      ●   Satisfactory care of the patient both during and
           desired result.                                         after the biopsy procedure with relevant
      ●    The best route can be utilized and vital                observations of vital signs. A pulse oximeter
           structures, such as blood vessels, avoided.             and appropriate nurse cover are now
                                                                   recommended.
      ●    Postprocedure complications, such as haema-
           toma, are minimized.                                ●   Appropriate preparation of the specimen.
      ●    Confidence in the biopsy result, particularly a     ●   Contraindications are relative and include the
           negative one, is increased due to direct                biopsy pathway, an uncooperative patient and
           visualization of the needle tip in the lesion.          uncorrectable coagulation and should be
                                                                   assessed on an individual basis.
      ●    All the advantages of ultrasound over other
           imaging methods apply (quick, direct vision,
           no radiation hazard, low cost). The limitations     Analgesia
           due to bone and air-filled structures also apply.   For the vast majority of biopsy procedures local
      ●    The capability to perform bedside procedures        anaesthetic is administered following localization
           for critically ill patients and to use in           of the biopsy site on ultrasound. Either 1% or 2%
           conjunction with other imaging techniques, for      lidocaine (lignocaine) is commonly used; the vol-
           example fluoroscopy, is advantageous.               ume will depend upon patient build, depth of
                                                               lesion and patient anxiety. Normally a short period
         With ultrasound the biopsy procedure is quick,        of time, commonly 4–5 min, is allowed to pass so
      safe and accurate and is therefore acceptable to the     that the anaesthetic can work, after which a small
      patient. There are several accepted methods of per-      scalpel incision is made in the skin to facilitate the
      forming a guided biopsy, but certain generic rules       biopsy needle’s introduction, with little or no dis-
      are common to the procedure, regardless of the           comfort to the patient.
      organ under investigation:                                  In cases of, for example, simple aspiration with a
                                                               22-gauge needle or smaller, local anaesthetic is
      ●    A written request form from a medical               normally unnecessary.
           practitioner with the results of any previous          Patients who are particularly apprehensive may
           investigations should be available. The reason      require preprocedure medication with a sedative
           for biopsy should be appropriate.                   such as diazepam or similar anxiolytic agent;
                                                               however this is not common. Very occasionally intra-
      ●    Assessment of blood clotting status. Normally
                                                               venous analgesia and/or sedation may be required
           the prothrombin time should be within 3 s of
                                                               during the procedure; it is often a good idea to have
           the control, platelet count > 75 000/ml and
                                                               an intravenous cannula in situ prior to biopsy.
           international normalized ratio (INR) < 1.3.
                                                                  The use of a general anaesthetic for children is
      ●    Identification of possible contraindications to     common practice, to enable the procedure to be
           biopsy, for example an uncooperative patient,       carried out quickly and accurately while the child
           coagulopathy.                                       remains still.
                                                                            INTERVENTIONAL AND OTHER TECHNIQUES             255


                                                                 on the size of the biopsy needle. It is often pre-
Methods of ultrasound guidance
                                                                 ferred to use one size greater than the needle, that
There are various ways of performing ultrasound-                 is a 16G insert for an 18G needle, as the needle
guided procedures: organ/lesion localization                     tends to move more freely. These guides are steril-
(‘blind biopsy’), biopsy guide or freehand tech-                 ized and fitted on to the transducer, which can
nique. The choice of method depends upon the                     either be covered by a sterile sheath or thoroughly
procedure in question, equipment and the experi-                 cleaned with chlorhexidine solution. The use of a
ence and skill of the operator.                                  sheath is highly recommended, as it maintains the
                                                                 sterility of the procedure, reducing the risk of
                                                                 infection, with no adverse effect on the image.
Blind biopsy
                                                                    The needle pathway is displayed on the ultra-
With this method a position on the skin surface is               sound monitor electronically as a line or narrow
marked overlying the organ or lesion to be biopsied,             sector, through which the needle passes. The oper-
using ultrasound to localize. This remains accept-               ator then scans in order to align the electronic
able for diffuse disease, when only a representative             pathway along the chosen route, the needle is
sample of liver tissue is required. Nevertheless, it is          inserted and the biopsy taken. These attachments
good practice even in these situations to visualize              should be tested regularly to ensure the needle fol-
the needle during the procedure, and this method                 lows the correct path (Fig. 11.2).
of biopsy is now used less frequently.
                                                                 Freehand
Biopsy guidance
                                                                 A freehand approach, in which the operator scans
Most manufacturers provide a biopsy guide which                  with one hand and introduces the needle near to
fits snugly on to the transducer head and provides               the transducer with the other, may be used for
a rigid pathway for the needle (Fig. 11.1). These                larger or more superficial lesions. This technique is
are now the commonest and preferred method of                    commonly used for breast biopsy and biopsy in the
biopsy. Previously adjustable angle biopsy guides                head and neck. The needle is inserted from one
were available; however these offered no specific                end of the probe at right angles to the ultrasound
advantages and were prone to user error. The fixed               beam; generally speaking the angle utilized is shal-
biopsy guides contain a groove for a series of plas-             low in comparison with the fixed guide systems for
tic inserts ranging from 14G to 22G size, depending              deeper structures.




                      d

                                                         C




       a                                             b



A                                                            B
Figure 11.1 (A) Necessary component parts to perform an ultrasound-guided biopsy procedure. A series of plastic
inserts (A) range in size from 14 to 22G. The appropriate insert is inserted into a fixed biopsy guide (B). The procedure
is performed with sterile jelly (C) and a sterile probe cover (D) if required. (B) The assembled biopsy guide.
256    ABDOMINAL ULTRASOUND




      Figure 11.2 Testing the alignment of the biopsy guide. The electronic pathway is activated on the image, and the
      needle is scanned as it is passed into a jug of water.




      Equipment and needles
      The core of tissue for histological analysis is
      obtained with a specially designed needle consist-
      ing of an inner needle with a chamber or recess for
      the tissue sample and an outer, cutting needle
      which moves over it—the Tru-Cut needle. The
      biopsy is obtained in two stages: first the inner
      needle is advanced into the tissue, then the outer
      cutting sheath is advanced over it and the needle
      withdrawn containing the required tissue core
      (Fig. 11.3).
          The use of a spring-loaded gun to operate these
      needles is now commonplace (Fig. 11.4). Such                Figure 11.3   Biopsy needle closed (top) and open
                                                                  (bottom).
      devices are designed to operate the needle with
      one hand; the whole needle is advanced into the
      tissue, just in front of the area to be biopsied. By
      pressing the spring-loaded control, the inner part          tion the needle tip on the edge of a lesion to obtain
      is rapidly advanced into the lesion, followed rapidly       a good histological sample as most lesion necrosis
      by the cutting sheath over it. These needles can be         tends to be centrally located.
      obtained in a variety of sizes—generally 14, 16, 18            Such biopsy guns enable the operator to scan
      or, less commonly, 20 gauge. Most focal lesions are         with one hand and biopsy with the other, observ-
      biopsied with a standard 18G needle. As a general           ing the needle within the lesion, yielding a high
      principle, as the needle advances approximately             rate of diagnosis with a single-pass technique1 and
      1.5–2.0 cm during biopsy, it is advisable to posi-          minimizing post-biopsy complications.
                                                                   INTERVENTIONAL AND OTHER TECHNIQUES             257


                                                         structures, for example the stomach, blood vessels,
                                                         en route to the site of interest, with no adverse
                                                         effects.
                                                            Fine needles for cytology are of 21 gauge or
                                                         smaller. They are of a simple design with a bev-
                                                         elled, hollow core and no cutting mechanism.
                                                            The needle is introduced under ultrasound
                                                         guidance to the required position. Fragments of
                                                         tissue are removed into the needle by applying
                                                         negative (sucking) pressure with a syringe to the
                                                         needle, while moving the needle to and fro to
                                                         loosen the tissue.
Figure 11.4 Spring-loaded gun designed to operate the       These can then be expelled on to a microscope
cutting needle.                                          slide and smeared. The main disadvantage of this
                                                         technique is that it requires a highly trained and
                                                         specialized pathologist to interpret the samples,
   As an alternative to the gun/needle combina-          whereas all trained pathologists can view histo-
tion a number of ‘self-fire’ needles are available.      logical specimens. In addition, for many condi-
This is essentially a single-use spring-loaded biopsy    tions, histological diagnosis is required, although
needle. Again these come in a variety of sizes but       cytology remains a useful tool in the breast and
their advantage is that they are easier and lighter to   thyroid.
use than the gun/needle combination, and there-
fore are easier employed in the CT situation. Most
departments will tend to utilize a combination of        ULTRASOUND-GUIDED BIOPSY
both.                                                    PROCEDURES
   In cases where the clinician is not familiar with
ultrasound techniques, appropriate guidance by
                                                         Liver biopsy
a sonographer, while the clinician biopsies, is          The most common reason for ultrasound-guided
highly successful, quick and avoids potential            biopsy is for suspected metastatic disease. The liver
complications.                                           is one of the most common sites for metastases and
   Fine-needle histology, involving the use of nee-      histology is often required to confirm the diagno-
dles of 21 gauge or less, reduces even further the       sis, or to identify the origin of an unknown primary
possibility of postprocedure complications. These        lesion (Figs 11.5 and 11.6).
are generally not used as only small amounts of tis-         Biopsy of other focal lesions in patients with
sue are obtained for analysis and, as thin needles,      chronic liver disease (for example, cirrhosis, hepa-
they are apt to bend more easily, and are therefore      titis B or C) in whom there may be suspected hepa-
more difficult to see and retain within the plane of     tocellular carcinoma and occasionally in patients
the scan. Biopsy of deep lesions is therefore more       with benign disease (for example, capillary hae-
difficult, if not impossible.                            mangiomas or focal nodular hyperplasia) can also
                                                         be performed, although MRI and contrast ultra-
                                                         sound are increasingly used to characterize lesions,
Fine-needle aspiration cytology
                                                         without recourse to biopsy.
Cytology is the analysis of cells rather than the core       Focal lesion biopsy is generally safely and accu-
of tissue obtained for histology. This is generally      rately performed with an 18G Tru-Cut needle
more difficult to interpret pathologically, as the       which yields reliable tissue for histological analysis.
characteristic architecture and intercellular rela-      In general an accuracy of 96% should be achiev-
tionships seen in a histological sample are absent.      able2 (Fig. 11.7).
It has the advantage, however, of allowing a finer           In addition to focal lesion biopsy another
needle to be used. This can be passed through            common reason for liver biopsy is to assess the
258    ABDOMINAL ULTRASOUND




                                                                                  RT




                                                                     Figure 11.7 A focal liver lesion immediately post-biopsy,
                                                                     two passes. Residual air is noted within the lesion
                                                                     outlining the recent biopsy tracks. This is a very useful
                                                                     appearance and visually confirms that the biopsy has
      Figure 11.5 In a liver full of metastases, the electronic
                                                                     been taken from the correct area.
      pathway is lined up on a hyperechoic lesion near the
      surface (arrows).
                                                                     clinical history and serological analysis can be
                                                                     helpful in determining aetiology; however biopsy
                                                                     is often required. This is normally performed
                                                                     with a 14G or 16G Tru-Cut needle. Very often
                                                                     the liver is simply identified with ultrasound and
                                                                     a suitable mark made on the skin, often in the
                                                                     mid-axillary line, and the biopsy performed
                                                                     through the right lobe. Although this is accept-
                                                                     able for this type of biopsy, as no guidance is
                                                                     required towards a specific focal lesion, ultra-
                                                                     sound guidance during the procedure is still
                                                                     preferable to the ‘blind’ technique in order to
                                                                     avoid large vessels and reduce the subsequent risk
                                                                     of haematoma. Biopsy may also be performed for
                                                                     patients with suspected rejection following
                                                                     hepatic transplantation.
                                                                        Where coagulation profiles are not correctable
                                                                     (and most generally are), liver biopsy can be per-
      Figure 11.6 The needle is introduced into the liver, just      formed using a ‘plugged’ technique or, more com-
      in front of the lesion, and the gun is fired, propelling the   monly, by the transjugular route (Fig. 11.8).
      needle tip into the chosen lesion (arrows).

                                                                     Pancreatic biopsy
      presence/absence of parenchymal liver disease,                 The commonest reason for biopsy of the pancreas
      severity of disease and, where appropriate, the                is in patients presenting with obstructive jaundice
      aetiology of the disease process. This is often per-           due to a mass in the head of the gland. A fine-
      formed in patients with abnormal liver function                needle technique enables the mass to be accessed
      tests with no evidence of biliary obstruction. The             through the stomach and left lobe of liver without
                                                                           INTERVENTIONAL AND OTHER TECHNIQUES              259




                                                             B




A                                                           C
Figure 11.8 (A) Transjugular biopsy of the liver. Access is via the right internal jugular vein, through the right atrium
and into the inferior vena cava and hepatic veins. Once the catheter is wedged in the hepatic vein the cutting needle is
released and a biopsy is taken. (B) Plugged liver biopsy technique. This is no longer, or only rarely, used. A 4F sheath
can accept an 18G biopsy needle and is inserted into the liver. Multiple biopsies can be taken: at the end of the
procedure the needle is removed and the biopsy track embolized via the sheath with embolic material, e.g. sterispon         AU: brand
and coils. (C) X-ray of the post-embolization track.                                                                        name?




complications. However an 18G needle biopsy is
                                                                 Native kidney biopsy
advisable to reduce false-negative results due to the
well-known situation of a carcinoma being associ-                Histology is frequently required in order to direct
ated with an element of peripheral inflammation.                 further management of diffuse renal disease.
Pancreatic biopsies are often better performed                   Biopsy of solid renal masses is rarely performed as
under CT control (Fig. 11.9), particularly when                  the diagnosis of renal cell or transitional cell carci-
lesions are small, patients big and/or the lesion is             noma is usually clear from imaging. Biopsies are
difficult to identify with ultrasound. In those                  still performed however in those patients who are
patients with negative biopsies very often interval              not having surgery to confirm the diagnosis; this is
CT scans are performed to see if the lesion is static            often required prior to chemotherapy or new ther-
or progressive.                                                  apeutic regimes. Biopsy of the native kidney is
260       ABDOMINAL ULTRASOUND




          R                                                 L                                                             R




      A                                                           B
      Figure 11.9 (A) CT-guided biopsy of a pancreatic head mass. The tip of the biopsy needle (arrow) is positioned in the
      periphery of the lesion so that when the biopsy is taken a good core of tissue is obtained. Note the artifact from the
      needle tip. (B) CT-guided bioposy of a retroperitoneal lymph node mass (arrowheads). The mass lies adjacent to the
      aorta (arrow); however this is protected from the needle by the angle of approach and its relationship to the vertebral
      body. CT is the preferred biopsy method of choice for deep structures within the retroperitoneum.


      performed in the majority of centres under ultra-               avoids undue damage to the kidney as the needle is
      sound guidance. Contraindications to biopsy                     introduced through the capsule. The needle
      include hydronephrosis, which may be more                       should be positioned just within the capsule prior
      appropriately treated with catheterization or                   to biopsy so that the maximum amount of cortical
      nephrostomy, or small kidneys, that is < 8 cm lon-              tissue is obtained for analysis, as the throw of the
      gitudinal axis (these appearances being indicative              needle may be up to 2 cm.
      of chronic renal impairment). Kidneys > 9 cm can
      potentially be biopsied; however other factors,
                                                                      Renal transplant biopsy
      including cortical thickness, age, clinical history
      and the requirement for definitive diagnosis will               Biopsy is a valuable tool in the postoperative man-
      all have a bearing on whether biopsy is performed               agement of the transplant patient (Chapter 7),
      or not. Hydronephrosis and kidney size are easily               enabling the cause of graft dysfunction to be iden-
      assessable with a prebiopsy scan.                               tified, in particular differentiating acute tubular
          In most cases the biopsy is performed with the              necrosis from acute rejection. Ultrasound guidance
      patient prone over a small bolster to maximize                  is essential in order to reduce complications such as
      access to the kidney. The shortest route, avoiding              haematoma, vascular damage (which may result in
      adjacent structures, is selected; subcostally, travers-         arteriovenous fistula or pseudoaneurysm forma-
      ing the cortex of the lower pole and avoiding the               tion) and laceration of the renal collecting system.
      collecting system and major vessels is recom-                   A single-pass technique, using the spring-loaded
      mended. With ultrasound guidance, either kidney                 biopsy gun with a 16-gauge needle, is usually
      may be chosen and accessibility will vary between               sufficient for histological purposes; however
      patients. The depth of penetration and angle of                 two passes are often required so that electron
      approach are carefully assessed. Biopsy is normally             microscopy and immunofluorescence can also be
      with a 16G needle.                                              perfomed. The procedure is well tolerated by the
          The patient’s cooperation is required with sus-             patient and the complication rate low, at less
      pending respiration at the crucial moment. This                 than 5%.3
                                                                      INTERVENTIONAL AND OTHER TECHNIQUES           261


   A full scan of the kidney is first performed to                                     Proposed route
highlight potential problems, for example peri-
renal fluid collections, and to establish the safest
and most effective route. The transplanted kid-
ney lies in an extraperitoneal position and the                                                     Lower
                                                                                                    pole
chosen route should avoid puncturing the peri-
toneum, to minimize the risk of infection. Unlike
the native kidney, the upper pole of the trans-
planted kidney is usually chosen to avoid major
blood vessels and the ureter, which pass close to                 Upper
the lower pole.                                                   pole
                                                              A
   The biopsy aims to harvest glomeruli, and the
chosen route should therefore target the renal cor-
tex. An angle is chosen to include the maximum
thickness of cortex and, where possible, avoid the
renal hilum (Fig. 11.10).


Complications of ultrasound-guided biopsy
Postprocedure complications such as haematoma
requiring blood transfusion and trauma to adjacent
viscera occur very infrequently when ultrasound
guidance is used. As expected, the risk of complica-
tions is less in fine-needle biopsy than with larger
needles;4 however, there is no significant difference
in complication rate between a standard 18G Tru-
Cut needle and a 22G Chiba needle.5 The mortal-
ity and major complication rates vary but using a         B
standard 18G needle these are approximately              Figure 11.10 (A) The transplanted kidney lies in the
0.018–0.038% and 0.18–0.187% respectively, mor-          iliac fossa and is biopsied with the patient supine. (B)
tality being due to haemorrhage in 70%. As a work-       The needle is seen entering a transplanted kidney
ing figure this means the mortality is approximately     (arrowheads).
1 in 3300–5400 and morbidity 1 in 530 biopsies
(Table 11.1).4,6,7 The risk of haemorrhage is               Complications following abdominal biopsy are
increased in patients with coexistent cirrhosis and is   increased with multiple passes and are at least in
more likely to occur with malignant than benign          part related to the skill and experience of the
lesions,8,9 although large haemangiomas also can         operator.
carry a significant risk of bleeding.                       If the biopsy result is negative or unexpected
   As with any procedure of this nature, there is a      then a number of scenarios should be considered
very small risk of infection, which can be mini-         and include sampling error, poor histological spec-
mized by using an aseptic technique.                     imen, sonographic or pathological misinterpreta-
   Tumour seeding of the biopsy tract is an uncom-       tion or indeed a true negative finding. A repeat
mon complication of biopsy and reports of tumour         biopsy is sometimes justified.
seeding are associated with repeated passes into the
mass using large needles. Although much talked
                                                         ULTRASOUND-GUIDED DRAINAGE
about, tumour track seeding is in fact rare, occurring
in approximately 1 in 20 000 biopsies.7,10 The best-     Many fluid collections are the result of surgical
known tumours for this are mesothelioma and              intervention and often cannot be differentiated
hepatoma.                                                on ultrasound alone. Diagnostic aspiration of
262    ABDOMINAL ULTRASOUND



       Table 11.1       Complications of ultrasound-guided        Gallbladder drainage
       biopsy
                                                                  Gallbladder drainage under ultrasound control is a
                                                        Major     temporary, palliative procedure which tends to be
                                 Number                 compli-   reserved for particularly ill patients with septi-
                                 of         Mortality   cation    caemia, as a method of stabilizing their condition
       Author            Year    biopsies   rate        rate      prior to surgery. Drainage of, for example, a gall-
       Fornari et al4    1989    10 800     1:5400      1:530     bladder empyema buys useful time, reducing the
       Nolsoe et al6     1990    8000       1:2700      1:540     risk of perforation and subsequent peritonitis and
       Smith7            1991    16 400     1:3300      —         improving clinical status prior to surgical removal.
                                                                  Although the portable nature of ultrasound allows
                                                                  a bedside procedure to be performed (which is par-
                                                                  ticularly useful in patients under intensive therapy
                                                                  who cannot be moved), these procedures carry a
      fluid collections is used to establish their                high risk to the patient and full anaesthetic, nurs-
      exact nature: this may include haematoma,                   ing and medical support is required.
      lymphocoele, urinoma, biloma, pseudocysts and
      others.
         Postoperative haematomas are normally treated
                                                                  Nephrostomy
      conservatively and tend to resolve spontaneously.           Renal obstruction in which the pelvicalyceal system
      Insertion of a drain into such a collection is at high      is dilated may be alleviated by the percutaneous
      risk of converting the collection into an abscess.          introduction of a nephrostomy tube under ultra-
                                                                  sound guidance. This procedure relieves pressure in
                                                                  the renal collecting system and avoids potential irre-
      Abscess drainage
                                                                  versible damage to the renal parenchyma (Fig.
      Ultrasound-guided drainage of abscesses is now              11.11). Although the procedure may be carried out
      the preferred treatment when the collection can             completely under ultrasound control, it is normally
      be visualized on ultrasound and a safe route cho-           performed in a screening room where a combina-
      sen. These may result from postoperative infec-             tion of ultrasound and X-ray screening can be used
      tion, inflammatory bowel conditions, such as                to maximal effect.
      Crohn’s disease or appendicitis, or other sources
      of infection, particularly in immunosuppressed
      patients. Drains come in different sizes and gen-
                                                                  Cyst drainage
      erally the thicker the pus, the larger the bore of          The percutaneous treatment of renal and hepatic
      drain that is required. Whilst aspiration is initially      cysts by simple aspiration may afford only temporary
      performed to confirm the nature of the collec-              relief as they frequently recur, but a more permanent
      tion, very often a drain is left in situ; together          result may be achieved by injecting a sclerosant, for
      with appropriate antibiotic therapy this is usually         example absolute alcohol or tetracycline into the
      effective. At the very least it normally leads to an        cyst. In addition, percutaneous treatment of hydatid
      improvement in the overall clinical condition to            liver disease (traditionally avoided because of the risk
      allow definitive treatment and can in itself be a           of spreading parasites along the needle track and
      definitive cure.                                            causing further infection) has been successfully per-
         Ultrasound is particularly useful in cases of hepatic    formed by injecting of a scolicidal agent,11 avoiding
      abscesses and in draining the subphrenic, pericolic         the need for surgical removal.
      and subhepatic areas. Superficial collections, usually         Other applications include draining of pancre-
      associated with wound sites, are also readily accessi-      atic pseudocysts and inserting a cystogastrostomy
      ble to ultrasound. Collections obscured by bowel gas        tube with combined fluoroscopy and ultrasound
      are best drained under CT guidance.                         guidance; the cyst is allowed to drain through this
                                                                         INTERVENTIONAL AND OTHER TECHNIQUES             263


tube into the stomach. This is now better done                 with a portable scanner, in practice excellent results
endoscopically.12                                              are obtained for larger, non-loculated collections,
                                                               particularly pleural effusions, by marking the skin
                                                               surface with a felt-tip marker in the main scanning
Indirect ultrasound guidance
                                                               department to enable drainage to be safely carried
Not infrequently drainage of fluid, for example                out on the ward.
from the pleural cavity, may be performed away                    The mark should be made with the patient in
from the ultrasound department in the ward or                  the position in which drainage is to be attempted,
clinic. Although ideally this is done under guidance           for example sitting or decubitus right side raised,




      LT




A                                                          B




                               C
Figure 11.11 (A) Longitudinal ultrasound image of the left kidney. There is clear evidence of hydronephrosis.
(B) Similar image during a nephrostomy procedure. The electronic ultrasound guide path can be easily visualized. The
guide wire (arrow) can also be seen within the renal pelvis and collecting system. (C) Longitudinal ultrasound scan of
the left kidney immediately following nephrostomy. The collecting system remains dilated due to injected contrast. The
echogenic tips of the drainage cathether (arrow) can be visualized within the renal pelvis.
264    ABDOMINAL ULTRASOUND



      and this information communicated to the clini-         In addition to lesion detection it is able to demon-
      cian performing the drainage, together with the         strate vascular invasion by tumour and to demon-
      depth from the skin surface to the fluid. The punc-     strate clearly, in real time, the relationship of the
      ture site should be marked so that the route is per-    tumour to adjacent vascular structures; this is essen-
      pendicular to the skin surface. Drainage of pleural     tial for planning a resection line. The greater the
      effusions and of ascites are the two most com-          margin of normal tissue around the resected
      monly performed procedures using this method.           tumour, the better the long-term prognosis, and a
                                                              margin of greater than 1 cm normal tissue is pre-
                                                              ferred. IOUS can also be used to locate deep lesions
      INTRAOPERATIVE ULTRASOUND (IOUS)
                                                              for ultrasound-guided biopsy or ablation.
      IOUS is increasingly used in the abdomen, in
      both the diagnosis and treatment of lesions. Its
                                                              Other applications of IOUS
      applications are varied and its dynamic nature,
      mobility and high resolution make it ideal for sur-     There are numerous extrahepatic applications for
      gical work.                                             IOUS in the abdomen, including urological, vas-
                                                              cular and gastrointestinal tract scanning.
                                                                 Ultrasound evaluation of the common duct for
      Hepatic IOUS
                                                              calculi following cholecystectomy can identify
      The most frequent application in the abdomen is         small fragments which may not be easily palpable
      in diagnosing and locating liver metastases prior to    through the duct wall. Using this technique the
      surgical resection. Resection of metastases, partic-    duct is less susceptible to injury which may be asso-
      ularly from colorectal tumours, is a potential          ciated with direct examination or the introduction
      cure, but results are unsuccessful if small lesions,    of X-ray contrast agents.
      undetected preoperatively, are not removed at              Pancreatic scanning is particularly useful in
      operation.                                              identifying small tumours of the body and tail of
         The direct contact of the IOUS probe with the        pancreas for curative resection16 and in differenti-
      liver surface, avoiding attenuative subcutaneous        ating small pancreatic retention cysts from solid
      tissue, enables a high-frequency (7.5 MHz) probe        nodules.17
      to be used. IOUS can demonstrate lesions too               The treatment of tumours by percutaneous ultra-
      small to be detected on preoperative imaging, and       sound-guided techniques, rather than surgical resec-
      as a result can change operative management13,14        tion, is becoming more common. However, it may
      in terms of altering the resection line to include      not always be possible to achieve success percuta-
      more tissue, removing additional hepatic seg-           neously and techniques have been developed to
      ments or even abandoning the operative proce-           ablate tumours during open surgery. Cryotherapy,18
      dure altogether.                                        in which the lesion is frozen by introducing a cryo-
         A combination of surgical palpation, which           probe into the centre of the lesion under intraoper-
      detects small surface lesions, and IOUS, which          ative ultrasound guidance, has been successfully
      detects small, deep lesions, has the highest diagnos-   used, but is now largely superseded by radio-
      tic accuracy. IOUS is quick to perform in the hands     frequency and microwave ablation (Fig. 11.13).
      of an experienced operator and its contribution to      These techniques have resulted in long-term sur-
      the success of surgery is invaluable15 (Fig. 11.12).    vival in patients with hepatocellular carcinoma19 and
         IOUS is particularly useful when there has been a    multiple liver metastases.20 The success of such tech-
      delay between preoperative imaging and surgery, as      niques depends to a large extent upon patient selec-
      progression of disease may have occurred during         tion. Those with very large and/or multiple lesions
      this interval, or when preoperative imaging is equiv-   tend to have a poor prognosis compared with
      ocal (for example, differentiating tiny cystic from     patients with smaller, well-confined disease.
      solid lesions). IOUS is often able to offer a defini-   However these techniques continue to develop and
      tive diagnosis and when doubt still exists guided       are likely to offer hope to many patients currently
      biopsy under ultrasound control may be performed.       untreatable with conventional methods.
                                                                          INTERVENTIONAL AND OTHER TECHNIQUES               265




               A                                            B




                             C                              D
Figure 11.12 Intraoperative ultrasound (A) Demonstrating a margin of tissue of only 2 or 3 mm between the
metastasis and the hepatic vein. (B) Metastasis in segment 8, at the confluence of the hepatic veins. (C) This metastasis
has started to invade the hepatic vein. (D) Tiny metastasis, not diagnosed on preoperative imaging and not surgically
palpable. (Differential diagnosis would be of haemangioma.)



LAPAROSCOPIC ULTRASOUND
                                                                   Laparoscopic ultrasound has also proven
Dedicated laparoscopic ultrasound probes may be                 advantageous in staging patients with hepatic
passed through the laparoscopic port during surgical            tumours for liver resection,22 demonstrating deep
procedures to investigate the liver, biliary tree,              tumours not visible on surgical laparoscopy, or by
pancreas and other viscera without the need for open            preoperative imaging methods and so avoiding the
surgery (Fig. 11.14).                                           need to proceed to open hepatic resection in some
   The trend towards laparoscopic rather than                   patients.
open cholecystectomy has increased the need for                    Patients with pancreatic head and ampullary car-
accurate laparoscopic exploration of the biliary                cinomas are potentially resectable in only a minority
ductal system to confirm the presence or absence                of cases. Preoperative imaging is known to under-
of stones. Laparoscopic ultrasound is better at                 estimate the extent of the disease, and so many
demonstrating stones in the duct and anatomical                 patients traditionally undergo a staging laparotomy
ductal variations than conventional intraoperative              before resection is attempted. However, over one-
cholangiography.21                                              third of patients previously considered resectable
266    ABDOMINAL ULTRASOUND




      A                                                           B
      Figure 11.13 Radiofrequency ablation (RFA). (A) The RF probe is introduced into the metastasis under intraoperative
      ultrasound guidance. (B) The lesion is gradually ablated; the area of ablated tissue reflects the sound and can be seen
      to increase in size progressively during the course of the therapy.




      will demonstrate occult metastases, often in the                   Laparoscopic ultrasound is also useful in stag-
      peritoneum.                                                     ing patients with gastric cancer24 and colorectal
         Staging laparoscopy still cannot demonstrate                 cancer.25 Curative resection of bowel cancer can
      intrahepatic metastases, and the use of laparoscopic            be performed with either open surgery or laparo-
      ultrasound at this stage greatly increases the accu-            scopic resection. Laparoscopic ultrasound can be
      racy of staging and influences the surgical deci-               used to examine the liver to confirm the absence
      sion.23                                                         of metastases: this is particularly useful in a
                                                                      laparoscopic resection as the surgeon is unable
                                                                      to palpate the liver under these circumstances.
                                                                      This laparoscopic approach reduces patient mor-
                                                                      bidity when compared with open surgical explo-
                                                                      ration.


                                                                      ULTRASOUND CONTRAST AGENTS
                                                                      IN THE ABDOMEN
                                                                      Ultrasound contrast media have been well estab-
                                                                      lished for cardiac imaging since the 1980s and the
                                                                      first clinical use of such an agent was in 1968 and
                                                                      involved the injection of saline to identify echoes
                                                                      from the mitral valve.26
                                                                          These early contrast agents were composed of
                                                                      relatively large (by today’s standards) microbub-
                                                                      bles of air in solution. They were unstable, short-
      Figure 11.14 Laparoscopic ultrasound demonstrating              lived and the bubbles were too large to pass
      multiple liver metastases in a patient with carcinoma in        through the capillary beds, hence their use exclu-
      the tail of the pancreas.                                       sively for cardiac ultrasound.
                                                                   INTERVENTIONAL AND OTHER TECHNIQUES              267


    Since those early years there have been a num-       summation of signal from non-linear scatterers
ber of developments in the field of contrast ultra-      (microbubbles) and cancellation of signal from
sound. Agents such as Albunex (Molecular                 linear scatterers (tissue).
Biosystems, San Diego, USA), consisting of albu-             Potential applications of these agents include
min-coated microbubbles, were small enough to            situations in which ultrasound findings are equivo-
pass through the pulmonary capillaries and enter         cal or in which Doppler information is suboptimal.
the left side of the heart; however they were too        A contrast agent will enhance the Doppler ultra-
weak to withstand systolic pressure and could not        sound signal from the blood pool and increase
therefore enter the blood pool in any appreciable        diagnostic confidence. This may therefore obviate
quantity.                                                the need for other more invasive angiographic
    A more stable suspension was then produced,          investigations.27 These agents therefore have the
consisting of small microbubbles in the order of         potential to extend the applications of Doppler
2–5 µm which passed through the pulmonary cap-           ultrasound in the abdomen.
illary bed after intravenous injection, and acted            With regard to the abdomen it can be useful in
as a true blood-pool agent. Called Levovist              patients with chronic liver disease for the investiga-
(Schering, Berlin, Germany), this is a galactose-        tion of portal vein thrombosis. Increased sensitivity
based agent (99.9%) containing palmitic acid             and specificity have been reported for examination
(0.1%) for stability, which traps air which is subse-    of the portal vein,28 avoiding the need for contrast
quently released when the bubbles burst. As the          angiography. In patients with hepatic transplanta-
first stable blood-pool agent it could be used for       tion it is helpful in confirming hepatic artery patency
examining the abdominal viscera and vasculature.         in the early postoperative period: this can be difficult
    By coincidence, microbubbles of this size can        to confirm with conventional imaging alone.
pass through the pulmonary capillaries and res-          Although it is felt intuitively that it may be of help
onate at frequencies used in clinical diagnostic         in the diagnosis of renal artery stenosis, the evidence
ultrasound (1–20 MHz). This resonance causes a           is as yet not convincing to support its routine use.
much greater capacity for scattering the beam than           The diagnosis and characterization of hepatic
that from a non-resonating particle and thus a           tumours are also improved with contrast agents as
stronger signal is produced of up to 25 dB on both       these agents, for example, Levovist and Sonovue,
grey-scale and Doppler. The Doppler signal from a        are preferentially taken up by the hepatosplenic
contrast-enhanced blood vessel is therefore much         parenchyma and so focal lesions appear as filling
easier to identify. In addition, vessels too small to    defects in much the same way as CT or MRI (Fig.
be identified on normal grey-scale or non-               11.16). The exact site of accumulation within the
enhanced Doppler scans can be identified when            liver is unknown but may be within the reticulo-
using a microbubble agent (Fig. 11.15).                  endothelial system or liver sinusoids. There is
    Despite the use of microbubble agents, blood         growing evidence to support the differentiation of
flow in tiny vessels can still be difficult to detect;   lesions within the liver, not previously possible
harmonic imaging techniques however aid detec-           with conventional ultrasound,29,30 and certainly
tion further. When insonated with ultrasound of a        microbubble agents are helpful in the diagnosis of
certain frequency, microbubbles emit a secondary         capillary haemangiomas, hepatomas and focal
harmonic frequency twice that of the incident            nodular hyperplasia. How are microbubble agents
wave, in addition to the primary harmonic. As the        used currently? Generally an agent such as Sonovue,
second peak is a purer signal, this increases the sen-   currently the most commonly used, which consists
sitivity, enabling smaller vessels with slow flow to     of a phospholipid membrane containing perfluoro-
be successfully detected and distinguished from          carbon gas, is injected intravenously. Imaging, for
surrounding tissues. Many harmonic-based pulse           example in the liver, can now be performed in both
methods are used with contrast agents and some of        a hepatic arterial and portal venous phase similar to
the more popular ones include pulse and phase            CT. Most imaging is performed with a harmonic-
inversion, for example pulse inversion is a dual         based technique—pulse or phase inversion—and
pulse technique, 180º out of phase, resulting in         utilizing a low mechanical index (< 0.15) to
268    ABDOMINAL ULTRASOUND




                            TIPS




                  A (i)                                                  A (ii)



                           HA                                              LAEVOVIST 300 MG/ML

                                                                           TIPPS




                   B (i)                                                B (ii)
      Figure 11.15 (A) i, Pre-injection of contrast—no flow is demonstrated in this transjugular intrahepatic portosystemic
      shunt; ii, post-injection, flow is still not demonstrated, confirming the shunt to be thrombosed. (B) i, the same patient—
      pre-injection the hepatic artery is identified adjacent to the shunt; ii, post-injection: without altering the settings,
      greatly enhanced arterial Doppler signals are demonstrated from even the most peripheral hepatic arteries.
                                                                                                                         (continued)


      prolong longevity of the bubbles. Although there                 agents may be developed specifically to examine the
      is no definitive evidence as yet to support its rou-             stomach or colon and to reduce bowel gas.
      tine use, it is currently undergoing a number of tri-
      als comparing it with CT and MRI in the detection
                                                                       THE TREATMENT OF PRIMARY AND
      of focal liver disease, and early results are
                                                                       SECONDARY HEPATIC TUMOURS BY
      favourable.31
                                                                       PERCUTANEOUS METHODS
         Other simple substances, technically considered
      contrast agents, including water or saline, are used to          In patients with colorectal carcinoma the presence
      outline the stomach (for example, to visualize the               of liver metastasis is the most accurate predictor of
      pancreas or to assess the nature of an epigastric mass)          survival. Resection of liver metastases is known to
      or the rectum. In the future, oral ultrasound contrast           increase the lifespan of patients, with good quality
                                                                             INTERVENTIONAL AND OTHER TECHNIQUES          269



                                                                 PV




                                                                                         MPV
                                                                      RPV




        c(i)                                             c(ii)
Figure 11.15 cont’d (C) i, Before contrast injection, portal vein thrombosis is suspected in a patient with alcoholic
liver disease; ii, after injection, the main portal vein is confirmed as thrombosed. Forward flow is seen in the right
portal vein (presumably due to collateral circulation), and increased hepatic arterial flow is clearly demonstrated.


of life and an overall 5-year survival of 20–45%,                     Ablation of liver metastases using RF is a
and up to 60% in unifocal disease. Without surgery                    recent method of ultrasound-guided therapy
the 5-year survival in this patient group is effec-                   for liver metastases and HCC in which RF,
tively zero. However, not all patients with liver                     applied to monopolar electrodes either
metastases are deemed suitable for resection, being                   individually or with multiprobe arrays, is
poor surgical risks or having lesions which are                       guided into the lesion to be treated. RF tissue
either too large or affect too many hepatic seg-                      ablation through an 18G needle uses fewer
ments. Percutaneous ablation of liver tumours is                      probes than laser. It is an outpatient procedure:
now a viable and rapidly developing option for                        1–4 sessions has been reported to achieve
control of liver metastases, prolonging survival                      complete necrosis of liver metastases in 67% of
time after initial diagnosis and, in some cases,                      lesions.34 It is a simple, safe and potentially
shrinking tumours to enable future curative resec-                    effective treatment for liver metastases,
tion. Various methods have been investigated,                         associated with a low rate of complications (in
using ultrasound guidance.                                            one study only one small area of haemorrhage
                                                                      was observed in 75 sessions)35 together with a
●   Alcohol injection has proved highly effective
                                                                      significant rate of shrinking or stabilization of
    for hepatocellular carcinoma (HCC),32,33
                                                                      the metastases.
    shrinking tumours over a period of time and
    causing necrosis within them, but has not
    proved as effective for metastatic liver disease.
    This is thought to reflect the fact that HCC is              ENDOSCOPIC ULTRASOUND
    a ‘soft’ tumour and so the alcohol can be
                                                                 Some of the limitations of conventional ultra-
    instilled effectively into the tumour whereas
                                                                 sonography in biliary and pancreatic imaging can
    metastases are ‘hard’ lesions and often the
                                                                 be overcome by the use of endoscopic probes and
    alcohol seeps out of the lesion.
                                                                 miniprobes. Endoscopic probes are either radial
●   Radiofrequency (RF) thermal ablation and laser               or linear arrays which are incorporated into the
    ablation are also developing as minimally                    end of an endoscope. They have a frequency of
    invasive percutaneous therapeutic techniques                 7.5–12 MHz and are used to image the pancreas,
    and are becoming increasingly popular.                       biliary tract, portal vein and adjacent structures
270       ABDOMINAL ULTRASOUND




      A                                                          B




      C                                                          D
      Figure 11.16 (A) Conventional ultrasound of the liver showing no abnormality. (B) Pulse inversion mode following
      intravenous Levovist injection showing a focal lesion (arrow) i.e. metastasis in the same patient as Fig. 16a. (C)
      Conventional grey-scale scan of the liver. A number of metastases were seen throughout the liver. One in the left lobe
      has been arrowed. (D) Pulse inversion mode with intravenous Levovist in the same patient as (C). The metastasis seen
      on the unenhanced grey-scale image can still be seen (arrow); however, easily discernible additional lesions are now
      also appreciated.




      within 5–6 cm of the probe. Radial probes may be                   Endoscopic ultrasound is more sensitive and spe-
      used in the preoperative staging of a number of                cific than spiral CT, MRI or transabdominal ultra-
      diseases, including oesophageal, gastric, pancre-              sound in the detection of small pancreatic masses
      atic and lung cancer, whilst linear array probes are           and its diagnostic ability can be further enhanced
      used for interventional procedures such as fine-               by the use of endoscopic ultrasonically guided fine-
      needle aspiration analysis of mediastinal lymph                needle aspiration cytology36 and biopsy.
      nodes, solid organ assessment, for example pan-                    It may also detect early changes of pancreatitis
      creas, occasionally liver, adrenals, pseudocyst                which are not visible on endoscopic netrograde
      drainage and coeliac plexus neurolysis.                        cholangiopancreatography (ERCP), and one of its
                                                                         INTERVENTIONAL AND OTHER TECHNIQUES               271


main uses is in staging pancreatic tumours, pre-              the extent and/or nature of small lesions already
dicting their resectability, identifying small lymph          identified by other imaging methods. It shows
node metastases and assessing vascular invasion.37            remarkable accuracy in the detection of common
It is particularly accurate in identifying small pan-         bile duct tumours and other biliary tract disease
creatic insulinomas,38 often difficult or impossible          when compared with other imaging modalities.42
to identify on conventional cross-sectional imaging               It may be used in the staging of oesophageal and
despite a documented biochemical abnormality,                 gastric cancer, and is especially useful when a tight
and thus guiding subsequent surgical procedures.              oesophageal stricture prevents the passage of the
Endoscopic ultrasound is also used in the detection           endoscope.41 The layers of the oesophageal or gas-
of biliary calculi, particularly in the normal-calibre        tric wall and the extent of tumour invasion can be
common bile duct, with a much higher accuracy                 accurately assessed.
than other imaging techniques and without the                     The miniprobe is also used in patients with sus-
potential additional risks of ERCP.39                         pected pancreatic carcinoma, for example in patients
   Further, less-established uses of endoscopic               with a negative CT but who have irregularity of the
ultrasound include gastrointestinal examinations,             pancreatic duct on contrast examination. The probe
in which invasion of gastric lesions into and                 can be passed into the pancreatic duct during ERCP
through the wall of the stomach can be assessed,40            to detect small lesions, assess the extent of the
anal ultrasound, which is used to visualize the               tumour and predict resectability.43 It is superior to
sphincter muscles in cases of sphincter dysfunction,          conventional endoscopic ultrasound in the detec-
the staging of colorectal carcinomas and the                  tion of the smaller, branch tumour nodules, and can
demonstration of bowel wall changes in inflamma-              also detect local retroperitoneal or vascular invasion
tory bowel conditions.41                                      in areas adjacent to the probe.
   The miniprobe has a higher frequency (20–30                    The use of endoscopic ultrasound is currently
MHz) and may be passed down a conventional                    limited to a few specialist centres. A steep learning
endoscope. It therefore has the advantage of a one-           curve together with the expense of the equipment
stage gastrointestinal tract endoscopy/ERCP,                  is likely to restrict its widespread use; however, as
rather than requiring a separate procedure. It may            its applications expand and its value becomes
be inserted into the common duct of the biliary               proven, it is likely to become a more routine inves-
tree to assess local tumour invasion and to clarify           tigation at many centres.41


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  Bibliography and further reading




Allan P, Dubbins P, Pozniak M, McDicken N. 2000          Gebel M. 1999 Ultrasound in Gastroenterology and
   Clinical Doppler Ultrasound. Churchill Livingstone,      Hepatology. Blackwell Science, Berlin.
   Edinburgh.                                            Lees WR, Lyons EA. 1996 Invasive Ultrasound. Martin
Bisset RAL, Khan AN. 2002 Differential Diagnosis in         Dunitz.
   Abdominal Ultrasound. Baillière Tindall, London.      Meire H, Cosgrove D, Dewbury K, Farrant P. 2001
Brooke JR, Ralls PW. 1995 Sonography of the Abdomen.        Clinical Ultrasound—Abdominal and General
   Raven Press, New York.                                   Ultrasound, 2nd edn. Churchill Livingstone,
Carty H, Brunelle F, Shaw D, Kendall B. 1994 Imaging        Edinburgh.
   Children. Churchill Livingstone, Edinburgh.           Williams P. 1999 Gray’s Anatomy. Elsevier, Edinburgh.
Damjanov I. 1996 Pathology for the Health-Related
   Professions. Saunders, Philadelphia.
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                                                                                                                       277




  Index




                                       Adenomyomatosis, 51–3, 52                 renal artery stenosis (RAS),
 A                                     Adrenal glands, 201–6, 204, 232,              179–80
                                              233                                renal calculi, 172–3
Abdomen, acute                         Adrenal haemorrhage, 232, 233             renal cell carcinoma (RCC),
  gastrointestinal tract, 245–6        Agenesis, renal, 224                          163–4
  hepatobiliary emergencies, 246–8     Air in the biliary tree, 72–3, 73         renal cysts, 160–1
  other retroperitoneal emergencies,   Alagille’s syndrome, 218                  splenic lymphoma, 141
      248–50                           Alcoholic cirrhosis, 98, 129           Appendicitis, 209, 238, 238–9, 239,
  pancreas, acute, 248                 Alcoholic-induced liver disease, 96,          245–6, 246
  renal tract emergencies, 248                97, 125, 126, 248               Appendix, 206–7, 209
  trauma, 244–5                        Alcoholism, 125                        Arrays, 7
  use of ultrasound, 243–4             American Institute for Ultrasound in   Artefacts, 30
Abdominal aorta, 195–9, 196                   Medicine (AIUM), 10             Arteriovenous fistulae, 181, 189, 191
Abdominal aortic aneurysms, 248        Amoebic abscess, 83                    Artery aneurysm, splenic, 147–8
Abscesses                              Amyloid, 179                           Artery stenosis, renal (RAS), 179–80,
  appendicitis, 246, 246               Anaemia, 82–3, 109–10, 139, 146               180, 187–9, 188
  drainage of, 262                     Analgesia, 254                         Ascaris worm, 70, 71
  hepatic, 82–4, 84, 95, 96, 116,      Aneurysms                              Ascites, 103, 212, 213
      247                                 aortic, 196–9, 198, 199, 248        Atresia, biliary, 112, 216–18
  psoas, 250                              renal artery, 191                   Atrial systole, 29
  renal, 175, 176, 187                    splenic artery, 147–8               Autosomal dominant polycystic
  splenic, 145                         Angiomyolipoma, 162, 163                      kidney disease (APKD), 161–2
Acalculous cholecystitis, 59           Aorta, 38, 213                         Autosomal recessive disease (PCKD),
Acquired cystic disease, 162, 162      Aortic aneurysms, 196–9, 199, 248             162
Acquired immunodeficiency              Appearances, ultrasound                Autosomal recessive polycystic disease
      syndrome (AIDS), 111, 139           adrenal glands, 201                        of the kidneys (ARPCDK),
Acute abdomen see Abdomen, acute          Budd–Chiari syndrome, 107–9                224–5
Acute appendicitis, 209                   cirrhosis, 97–9
Acute cholecystitis, 59, 246              hepatic metastases, 90–2
Acute diverticulitis, 246                 hepatitis, 106–7                     B
Acute fatty liver, 109                    hepatocellular carcinoma, 94
Acute hepatitis, 106, 107                 kidneys, 155                        Beckwith–Wiedemann syndrome,
Acute pancreas, 248                       normal spleen, 137–9, 138                  218, 229
Acute tubular necrosis (ATN),             normal transplanted kidney,         Benign focal liver lesions, 79–89
      177–8, 189, 260                         182–5                           Benign focal pancreatic lesions,
Acute ureteric obstruction, 248           pancreas, 123                              133–4
Adenocarcinomas, 130, 132                 pancreatic carcinoma, 132           Benign focal renal tumours, 162–3
Adenomas, 86, 86–7, 95, 162–3,            pancreatic transplant, 135          Benign splenic conditions, 143–8
      203, 205                            pancreatitis, 125                   Bile, 49, 71
278    INDEX


      Bile ducts, 31–3                             pancreatic, 128, 129, 132             Cholelithiasis see Gallstones
          see also Common bile duct (CBD)          renal tract, 170–4                    Cholestasis, 110, 112, 216–18, 218
      Biliary                                      splenic, 145, 145–6                   Cholesterolosis, 53–4, 54
          atresia, 112, 216–18, 219             Calcium stones, 171                      Choosing a machine, 6–9
          biliary tree, 17                      Candidiasis, 229, 230                    Chronic cholecystitis, 59
          calculi, 125                          Candidiasis abscess, 83–4                Chronic liver disease, 257
          colic, 52, 70                         CAPD fluid, 111                             see also specific disease
          crystals, 72, 72                      Capillary haemangiomas, 257              Ciclosporin nephrotoxicity, 191
          dilatation, 248                       Carcinomas                               Cirrhosis
          dilation without jaundice, 66–7          adenocarcinoma, 130, 132                 alcoholic, 98, 129
          obstruction, 246                         adrenal, 206                             and chronic hepatitis, 107
          reflux, 47                               bowel, 36, 91, 212, 212                  and hepatocellular carcinoma
          sludge, 56                               breast, 143, 213                             (HCC), 94
          stasis, 71–2                             cervical, 167                            causes of non-obstructive
          see also Bile ducts; Gallbladder         cholangiocarcinoma, 64, 67, 68,              jaundice, 96
      Bilirubin, 34–5                                  74, 75, 95                           increased echogenicity, 111
      Biochemical analysis, pancreas, 123          colorectal, 268–9, 271                   liver biopsy in patients with, 257,
      Biological effects of ultrasound, 10–11      cystadenocarcinoma, 130, 132                 261
      Biopsy attachments, 7                        gallbladder, 50, 73, 73                  liver transplants, 110, 112
      Biopsy, renal, 179, 259–61                   gastric, 208                             micronodular, 97
      Biopsy, ultrasound-guided see                hepatocellular carcinoma (HCC)           ultrasound appearances, 97–9
              Ultrasound-guided biopsy                 (see Main entry)                  Coarse texture of the liver, 111
      Bladder                                      lung, 205                             Colic, acute renal, 249
          diverticulum, 175, 176                   oesophagus, 207                       Colitis, ulcerative, 209
          paediatric, 221                          ovarian, 75, 80, 81, 90, 111          Colonic carcinoma, 36
          tumour, 4                                pancreatic, 128–33, 131, 247, 266,    Colonic mass, 210
      Blind biopsy, 255                                271                               Colorectal carcinoma, 268–9, 271
      Blood clot, renal, 167, 168–9                renal, 134, 163–5, 164, 202           Colour Doppler
      Blood in the gallbladder, 72                 transitional cell carcinoma, 164–5,      diagnosing cholecystitis, 54
      Blood tests for renal function, 157              165, 166                             dilated bile duct, 61
      Bone-at-focus index (TIB), 11             Cardiac failure, 111                        hepatic vein, 5
      Bone-at-surface index (TIC), 11           Caroli’s diesease, 68–70, 70                pancreatic duct, 131
      Bowels                                    Cervical carcinoma, 167                     pancreatic transplant, 135
          carcinoma, 91                         Chemotherapy, 91                            portal venous system, 26, 101
          gas in, 29, 63, 223                   Children see Paediatric abdomen             renal tract, 155–6, 157
          malignant tumours in the, 210–11      Cholangiocarcinomas, 64, 67, 68,            thermal effects of, 11
          perforation of the, 245                      74, 75, 95                           use of, 2–4
          problems in the, 36                   Cholangitis, 66, 66, 70, 247, 247        Common bile duct (CBD)
          rupture of the, 244                   Cholecystectomy                             cysts, 64–6, 66, 68–70, 218, 219
      Breast carcinoma, 143, 213                   acalculous cholecystitis, treatment      dilated, 58–67, 59, 62, 65, 66–7
      Budd–Chiari syndrome (BCS)                       for, 247                             normal, 25, 27, 31–3, 32
          free intraperitoneal fluid, 111          bile duct measurements, 33, 33           obstructed, 130
          indications for liver                    choledocholithiasis, 45                  postoperative ultrasound
              transplantation, 112                 gallstones, management of, 47, 52            appearances, 116
          liver metastasis, 203                    laparoscopic, 56, 67                     stones in, 45–7, 46, 218
          management of, 108–9                     scar, 29                                 see also Gallbladder
          risk of thrombosis, 115               Cholecystitis                            Complex cysts, 80–1, 81
          ultrasound appearances of, 107–8,        acalculous, 56–7, 59, 247             Complications, post operative renal
              108                                  acute, 54–6, 55, 59, 111, 246                transplant, 185
          with suspected liver lesion, 94          chronic, 56, 59                       Computed tomography (CT) scan,
                                                   complications of, 47, 57–8                   167, 212, 229, 232, 244, 246,
                                                   emphysematous, 60                            259
       C                                        Cholecystokinin-stimulated hepatic       Congenital anomalies of the
                                                       iminodiacetic acid (HIDA)                pancreas, 123–4
      Caecal carcinoma, 212, 212                       scan, 57                          Congenital intrahepatic biliary
      Calcification                             Choledochal cysts, 64–6, 66, 68–70,             dilation, 68–70
         adrenal, 232, 233                             218, 219                          Congenital megacalyces, 170
         hepatic, 88–9, 90                      Choledocholithiasis, 45–7                Congestive cardiac disease, 109
                                                                                                             INDEX       279


Continuous ambulatory peritoneal         Dissolution therapy, 48                Extracorporeal shock wave lithotripsy
      dialysis (CAPD), 181–2             Diuretic renogram, 229                       (ESWL), 48
Contracted gallbladder, 49–50, 50        Diverticulitis, 210, 211, 246          Extrarenal pelvis, 158, 160
Contrast agents, 266–8, 268, 269         Doppler
Contrast sonocystography, 229               cirrhosis, 98
Cortical scintigraphy, 229                  correlation, 189                     F
Cranial index (TIC), 11                     detecting flow, 7
Crohn’s disease, 111, 209, 211, 246         hepatic metastases, 92              Faeces, impacted, 36
Cryotherapy, 264, 266                       kidneys, 248                        Failure, renal, 111, 177–9
Cyst drainage, 262–3                        pancreatitis, 125                   Fasting, 27, 29
Cystadenocarcinomas, 130, 132               sensitivity, 114                    Fatty infiltration, 87, 88, 95–7, 96,
Cystadenomas, 81, 81                        spectra, 26                                111
Cystic disease, 160–2                       use of, 2–6, 18                     Fatty sparing, 87, 87–8
Cystic duct, 49                             using microbubble agents, 267       Fever, 82–3
Cystic duct obstruction, 48, 50             see also Colour Doppler; Power      Fibrosis, 67, 111
Cystic fibrosis (CF)                            Doppler                         Field, size of, 2
   changes in liver reflectivity, 111    Double gallbladder, 31                 Fine needle aspiration cytology, 257
   cholestasis, 218                      Drainage, ultrasound-guided, 261–4     Fistulae, 209
   cysts, 134                            Drug-induced liver disease, 96         Flow
   gallstones, 50                        Drug-induced pancreatitis, 125            detection with Doppler, 7
   general information, 216              Duodenal gas, 63                          in major vessels, 5–6
   increased echogenicity, 221           Duodenum, 30, 32                          velocity waveforms, 6
   microgallbladder, 51                  Duplex kidneys, 158, 159, 221–3,       Fluid collections, transplantation,
   ultrasound appearances, 109, 109,            222, 225                               186–7
      217                                                                       Focal fatty change, 87–8, 87–8, 95
Cystine stones, 171                                                             Focal fatty sparing of the pancreas,
Cystinuria, 173, 173                      E                                            133
Cysts                                                                           Focal lesions, 116
   adrenal, 203                          Echogenic bile, 71–3                   Focal liver lesions, 24, 112
   choledochal, 218, 219                 Echogenicity, 111, 124, 221            Focal nodular hyperplasia, 88, 89, 95,
   enteric duplication, 239–40, 240      Ectopic gallbladder, 30                       257
   hepatic, 79–81, 80, 81, 82            Ectopic kidneys, 158, 223              Focal obstruction, 67
   hydatid, 82                           Ectopic pregnancy, 111                 Focal pancreatitis, 133–4
   in children, 221                      Electrical safety, 11                  Focal zone, 2, 3, 5, 44
   in obese patients, 4                  Emphysematous cholecystitis, 58, 60    Focused Assessment with
   ovarian, 111                          Empyema, 58, 61                               Sonography for Trauma
   pancreatic, 132, 134, 134             Endocrine tumour, 132                         (FAST), 244
   renal, 160–1, 161                     Endometriosis, 167                     Folded gallbladder, 29, 30, 31
   splenic, 144, 144                     Endoscopic retrograde                  Fracture, pancreatic, 246
Cytology, 257                                   cholangiopancreatography        Frame rate, 2, 3, 5
                                                (ERCP), 47, 62                  Free fluid detection, 244, 245
                                         Endoscopic ultrasound, 64, 246,        Free intraperitoneal fluid, 111
 D                                              269–71                          Freehand biopsy, 255
                                         Endosonography, 210                    Frequency
Deep inspiration, 18                     Enlargement of the gallbladder, 48–9      changing, 2
Defensive scanning, guidelines for, 13   Enlargement of the spleen, 109, 139,      increasing the, 1, 5
Departmental guidelines, 13                     139, 140, 146                      range of, 7
Design of machines, 7                    Enteric duplication cysts, 239–40,        settings for gallbladder, 2, 27, 30
Dialysis, ultrasound in, 181–2                  240                             Fundamental imaging mode, 4
Diethylene triaminepenta-acetic acid     Epigastrium, 28, 29, 208               Fungal balls, 167, 191, 229, 230
       (DTPA) scan, 158, 167             Equipment for biopsy, 255, 256–7       Fungal infections, 229
Diffuse liver conditions, 95–110         Equipment tests, 14–15
Dilation                                 Ergonomics of machines, 8
   PCS, 166                              European Committee for Ultrasound       G
   renal, 225–6, 226                            Radiation Safety (ECURS), 10
   renal transplant, 185                 European Federation of Societies for   Gallbladder
Dimer capto succinic acid (DMSA)                Ultrasound in Medicine and        biliary dilation without jaundice,
       scan, 223                                Biology (EFSUMB), 10                  66–7
280    INDEX


      Gallbladder (Continued)                     malignant tumours, 210                 in a patient with cirrhosis, 94, 95,
        blood in the, 72                          mesenteric ischaemia, 207–9                98
        carcinoma, 50, 73, 73                     obstruction, 211                       treatment of, 269
        cholecystitis (see Main entry)            oesophagus and stomach, 206            viral hepatitis, 106
        cholelithiasis, 41–8                      paediatric, 232–40                   Hepatomas, 261
        contracted or small, 49–50, 50         Gilbert’s disease, 96                   Hepatomegaly, 220
        double, 31                             Glomerulonephritis, 178–9               Hippel–Lindau disease, 134
        drainage of, 262                       Glycogen storage disease, 99            Hodgkin’s lymphoma, 139, 165
        echogenic bile, 71–3                   Granulomatas, 88, 90, 95, 146           Horseshoe kidneys, 158, 159, 223,
        ectopic, 30                            Guidance, biopsy, 255                         223
        enlargement of the, 48–9               Guidelines, departmental, 13            Hydatid cysts, 82, 82, 177
        folded, 29, 30, 31                                                             Hydronephrosis, 168, 168–9, 170,
        frequency settings for, 2, 5, 27, 30                                                 225–6, 263
        full abdominal survey, 17               H                                      Hyperaemia, 54, 56
        hyperplastic conditions of the                                                 Hyperparathyroidism, 173–4
            wall, 51–4                         Haemangioblastomas, 134                 Hyperplastic conditions of the gall
        in children, 216                       Haemangioendotheliomas, 220                   bladder wall, 51–4
        in the obese patient, 4                Haemangiomas, 3, 85–6, 85–6, 95,        Hypertension, portal see Portal
        inflammatory gallbladder disease,            145                                     hypertension
            54–8                               Haemangiomatas, 219                     Hypertrophic pyloric stenosis (HPS),
        introduction, 27–9                     Haematomas                                    234, 235
        malignant biliary disease, 73–6          complications of biopsy, 258, 261     Hypervascularized bowel, 210
        metastases, 76                           hepatic, 84, 84–5, 96, 116            Hypotrophied column of Bertin,
        microgallbladder, 50, 51, 216, 217       psoas, 250, 250                             158–9
        mucocoele, 48                            renal, 187
        normal variants of the, 29               subcapsular, 245
        obstruction without biliary              subphrenic, 117                        I
            dilation, 67                       Haematuria, 182
        obstructive jaundice and biliary       Haemo-hydronephrosis, 168–9             Image optimization, 1–2
            duct dilation, 58–66               Haemobilia, 72                          Image quality, 1–2, 7–8
        other biliary diseases, 67–71          Haemochromatosis, 99, 221               Images, recording of, 9–10
        pitfalls in scanning the, 29–31        Haemodynamics, 25–7, 155–6              Imaging the paediatric renal tract,
        polyps, 28                             Haemolysis, 96                                 229
        porcelain, 50, 51                      Haemolytic anaemia, 139, 146            Impacted faeces, 36
        removal (see Cholecystectomy)          Haemorrhage, 232, 233, 248, 261         Impacted gallstones, 45, 45
        septum, 29                             Haemorrhagic tumour, 132                Incorrect use of equipment, 5
        stones (see Gallstones)                Harmful effects of ultrasound, 10–12    Increasing the frequency, 1
        strawberry, 53–4, 54                   HELLP syndrome, 109–10, 110             Indirect ultrasound guidance,
        ultrasound appearances, 31, 32         Hepatic see Liver                              263–4
      Gallstones                               Hepatitis, 106–7, 107, 111, 139,        Infarction of the spleen, 146, 147
        abdominal pain, 36, 248                      216, 257                          Infection, renal tract, 174–7, 189
        chronic cholecystitis, 56              Hepatobiliary system                    Inferior vena cava (IVC), 199–201,
        clinical features, 41–2                  bile ducts, 31–3                             200, 201
        gallstone pancreatitis, 47, 246          common referral patterns, 33–6        Inflammation
        general information, 42–5                gallbladder, 27–31                       gastrointestinal tract, 245–6
        in the common bile duct, 45–7            hepatobiliary emergencies, 246–8         renal tract, 174–7
        small gallbladder, 50                    hepatobiliary pathology: paediatric   Inflammatory bowel conditions,
        ultrasound appearances, 42, 51               abdomen, 216–20                          209–10
      Gangrenous cholecystitis, 57–8, 59         introduction, 17–18                   Inflammatory gallbladder disease,
      Gas, bowel, 29, 63, 212, 223               liver, 18–27                                 54–8
      Gastric carcinoma, 208                     upper-abdominal anatomy, 36–9         Inspiration, deep, 18
      Gastrinomas, 128                           upper-abdominal technique, 18         Inspissated bile, 71, 71
      Gastro-oesophageal reflux, 238             see also Bile ducts; Liver            Insulin-dependent diabetes, 135
      Gastrointestinal tract                   Hepatoblastomas, 218–20, 219, 234       Insulinomas, 128
        acute presentations of, 245–6          Hepatocellular carcinoma (HCC)          Intercostal scanning, 18
        appendix, 206–7                          biopsy procedures, 257                Intrahepatic tumours, 64, 67
        inflammatory bowel conditions,           general information, 93–5             Intraoperative ultrasound (IOUS),
            209–10                               hepatobiliary pathology, 218–20              113, 264, 265
                                                                                                            INDEX       281


Intravenous urography (IVU), 229,         obstruction of the, 166–7,             hepatic artery (HA), 6, 27, 30,
      248                                    169–70, 249                             104, 113
Intussusception, 234–6, 236               PCS dilation and obstructive           hepatic biopsy, 257–8, 258, 259
                                             uropathy, 166–70                    hepatic venous system, 5, 28, 38
                                          pelvic kidney, 224                     jaundice, 34, 34–5
 J                                        renal artery stenosis (RAS),           liver fluke, 70
                                             179–80, 180, 187–9, 188             liver function tests (LFTs), 35, 58,
Jaundice                                  renal cell carcinoma (RCC),                82–3
   common causes of, 34                      163–4                               liver transplants, 110–17
   general information, 34–5              renal fusion, 223                      malignant focal liver lesions,
   neonatal, 216                          renal humps, 160                           89–95
   non-obstructive, 93, 96                renal tract emergencies, 224, 248      mass, 89, 90
   obstructive, 58–67, 213, 246,          renal transplants, 182–91              metastases (see Hepatic under
      247, 258                            renal vein thrombosis (RVT) (see           Metastases)
                                             Main entry)                         normal appearances, 18–24,
                                          rupture of the, 244                        18–24
 K                                        stones, 167, 171–3, 172                polycystic, 81–2
                                          transplant biopsy, 260–1, 261          rupture of the, 244
Kidneys                                   transplants, 182–91, 183, 184          segments of, 24, 24
   abscesses, 175, 176, 187               trauma, 182                            texture of the, 111
   acute renal colic, 249                 vascular pathology, 179–82             transplants
   agenesis, 224                       Klatskin tumour, 74, 74                       indications for, 110–11
   aneurysms, renal artery, 191                                                      operative procedure, 112–13
   autosomal dominant polycystic                                                     postoperative assessment, 113
       kidney disease (APKD), 161–2     L                                            postoperative ultrasound
   autosomal recessive polycystic                                                        appearances, 113–17
       disease of the kidneys          Laparoscopic cholecystectomy, 56              preoperative assessment,
       (ARPCDK), 224–5                 Laparoscopic ultrasound, 48, 64,                  111–12
   benign focal renal tumours,                265–6, 266                         tumours, treatment of, 268–9
       162–3                           Laser ablation, 269                       use of equipment, 2, 3
   biopsy, 179, 259–61                 Legal issues, 12–13                       vasculature, 25
   calcification of, 170–4             Leukaemia, 111, 139, 142–3, 220,          see also Cirrhosis
   carcinoma, 134, 163–5, 164, 202            234                              Lung cancer, 270
   cysts and cystic disease, 160–2,    Line density, 1, 2                      Lymph nodes, enlarged, 213
       161                             Links to image-recording devices,       Lymphadenopathy, 92, 132, 149,
   devascularization of the, 246              8–9                                    149, 213
   diffuse renal disease and renal     Lipomas, 88                             Lymphangiomas, 150, 150
       failure, 177–9                  Litigation, 12–13                       Lymphatics, 148, 148–50, 149
   dilation, 185, 225–6, 226           Liver                                   Lymphocoele, 187, 187
   disease, 135                           abscesses, 82–4, 84, 95, 96, 116,    Lymphomas
   duplex kidneys, 158, 159, 222,             247                                hepatic, 220
       225                                acute fatty liver, 109                 Hodgkin’s, 139, 165
   ectopic kidneys, 158, 223              alcohol-induced liver disease, 96,     in children, 234
   failure, 111, 177–9                        97, 125, 126, 248                  metastases, 91
   full abdominal survey, 17              anatomy, 36, 37                        non-Hodgkin’s, 139, 165, 203
   function tests, 157                    benign focal liver lesions, 78–9,      renal, 165
   horseshoe kidneys, 158, 159, 223,          79–89                              splenic, 141, 142
       223                                calcification, 88–9, 90              Lymphoproliferative disorder, 116
   inflammation and infection,            chronic liver disease, 257
       174–7, 189                         cirrhosis (see Main entry)
   malignant renal tract masses,          conditions in pregnancy, 109–10       M
       163–6                              diffuse liver conditions, 95–110
   measurements of, 155                   drug-induced liver disease, 96       Magnetic resonance
   medullary sponge kidney, 179           failure of the, 111                       cholangiopancreatography
   metastases, 165–6                      full abdominal survey, 17                 (MRCP), 62
   multicystic dysplastic kidney          haematoma, 84–5                      Magnetic resonance imaging (MRI),
       (MCDK), 162, 224, 225              haemodynamics of, 25–7                    212, 229, 232, 246
   normal, 154, 154–60                    hepatic abscess, 247                 Maintenance of machines, 8
282    INDEX


      Malignant biliary disease, 73–6            Multicystic dysplastic kidney            pancreas, 220, 220–1
      Malignant focal liver lesions, 89–95             (MCDK), 162, 224, 225              techniques, 215–16
      Malignant obstruction, 64                  Murphy’s sign, 54, 57                    urinary tract, 221–32
      Malignant renal tract masses, 163–6        Myelolipomas, 204, 205                Pain, upper abdominal, 36
      Malignant splenic disease, 141–3                                                    see also Abdomen, acute
      Malignant tumours, bowel, 210–11                                                 Palpable right upper quadrant mass,
      Management of gallstones, 47                N                                           36
      Mass                                                                             Pancreas
        colonic, 210                             Necrotic tumour, 132                     acute, 248
        hepatic, 89, 90                          Needles, biopsy, 256, 256–7              anatomy, 37, 39
        malignant renal tract, 163–6             Neonatal cholestasis, 216–18             benign focal pancreatic lesions,
        retroperitoneal, 212                     Neonatal hepatitis, 216                      133–4
        see also specific condition              Neonatal jaundice, 216                   biochemical analysis, 123
      Measurements of the bile duct, 33          Nephrocalcinosis, 173, 174               biopsy, 258–9, 260
      Measurements of the kidneys, 155           Nephrostomy, 262, 263                    calcification, 128, 129, 132
      Mechanical effects of ultrasound, 11       Nephrotic syndrome, 90                   congenital anomalies, 123–4
      Mechanical Index (MI), 11                  Neuroblastomas, 232, 234                 cysts, 132, 134, 134
      Meckel–Gruber syndrome, 221                Nodular texture of the liver, 111        focal fatty sparing, 133
      Medicolegal issues, 12–13                  Non-Hodgkin’s lymphoma, 139,             fracture of, 246
      Medullary sponge kidney, 179                    165, 203                            frequency settings, 2
      Meig’s syndrome, 111                       Non-obstructive hydronephrosis, 170      full abdominal survey, 17
      Melanomas, 143                                                                      malignant pancreatic disease,
      Mesenteric ischaemia, 207–9                                                             128–33
      Mesotheliomas, 261                          O                                       metastases, 132, 133, 133
      Metastases                                                                          normal, 121–4, 122
        adrenal gland, 203, 233                  Obese patients, 4                        paediatric, 220, 220–1
        gallbladder, 76                          Obstruction                              pancreatic carcinoma, 128–33,
        hepatic                                    biliary, 246                               131, 247, 266, 271
            biopsy, 257, 258                       gastrointestinal tract, 245–6          pancreatic ducts, 59, 128, 131
            causes of, 203, 220                    intestinal, 211                        pancreatic transplant, 135
            changes in liver reflectivity, 111     non dilated renal, 169–70              pancreatitis
            clinical features and                  of the pancreatic duct, 128                acute, 81, 111, 126, 248
                management, 90–2                   pelvi-ureteric junction, 226               endoscopic ultrasound, 270
            examples of, 91, 93                    renal, 166–7, 249                          focal, 132, 133–4
            intraoperative ultrasound,             urinary tract, 248                         gallstone, 47, 246
                264                                without biliary dilation, 67               general information, 124–8
            laparascopic ultrasound, 266         Obstructive jaundice, 58–67, 213,            paediatric, 221
            multiple, 208                              246, 247, 258                      rupture of the, 244
            necrotic, 92                         Oedema, 187                              techniques, ultrasound, 121–3
            ultrasound appearances, 90–2         Oesophagus, 206, 207                     transplants, 135
        pancreatic, 132, 133, 133                Operator safety, 12                      trauma of the, 125, 134–5
        renal, 165–6                             Operator skill, 17                    Papillary necrosis, 167, 170, 171
        retroperitoneal, 213                     Oral contraceptives, 86               Parasites, 70–1, 82
        splenic, 141–2, 143                      Organ damage, 111                     Pelvic kidney, 224
      Microbiological safety, 12                 Organ failure, 111                    Pelvicalyceal system (PCS) dilation
      Microbubble agents, 267                    Output Display Standard (ODS), 11            and obstructive uropathy,
      Microgallbladder, 50, 51, 216, 217         Ovarian carcinoma, 75, 80, 81, 90,           166–70
      Microlithiasis, 72, 72                           111                             Percutaneous drain, 84
      Micturating cystourethrogram, 229          Ovarian cyst, 111                     Perforated appendix, 209
      Midgut volvulus, 236–7, 237                Ovarian fibroma, 111                  Pericholecystic abscess, 56–7
      Minimizing the ultrasound dose,                                                  Peritoneum, 195
            12–13                                                                         see also Retroperitoneum
      Mirizzi syndrome, 48–9, 50                  P                                    Peritonitis, 111
      Misinterpretation, 1                                                             Pernicious anaemia, 139
      Mobility, gallstones, 44, 45               Paediatric abdomens                   Phaeochromocytomas, 134, 204–6,
      Mononucleosis, 139                            adrenal glands, 232                       205
      Mucinous tumour, 132                          gastrointestinal tract, 232–40     Photographic archiving
      Mucocoele of the gallbladder, 48              hepatobiliary pathology, 216–20           communications (PAC), 8, 10
                                                                                                             INDEX     283


Phrygian cap, 29                                                               Spleen
                                        R
Pneumobilia, 72–3, 73                                                             abscess, 145
Polycystic disease, 134, 144, 161,                                                benign splenic conditions, 143–8
                                       Radio frequency (RF) thermal
       224–5                                                                      calcification, 145, 145–6
                                             ablation, 269
Polycystic liver, 81–2                                                            cysts, 144, 144
                                       Radioisotope scans, 158
Polyps, 53, 53, 54                                                                enlarged paediatric, 217
                                       Radionuclide cystography, 229
Polyps, gallbladder, 28                                                           full abdominal survey, 17
                                       Recording of images, 9–10
Porcelain gallbladder, 50, 51                                                     haemangioma, 145
                                       Rectal cancers, 210
Portal hypertension                                                               laceration of, 245
                                       Referral patterns for hepatobiliary
   free intraperitoneal fluid, 111                                                lymphoma, 141, 142
                                             ultrasound, 33–9
   general information, 99–105                                                    malignant splenic disease,
                                       Reflectivity, 44, 111
   management of, 105–6                                                               141–3
                                       Reflux, 170, 225, 227, 238
   splenomegaly in, 139, 139, 217                                                 metastases, 141–2, 143
                                       Reidel’s lobe, 36
   ultrasound appearances, 100, 102                                               normal, 137–9, 138
                                       Rejection, transplant, 117, 185–6,
Portal vein                                                                       rupture of the, 244
                                             186
   anastomosis, 114                                                               small accessory spleen, 139–40
                                       Renal cell carcinoma (RCC), 163–4
   flow, 99–103                                                                   splenic artery aneurysm, 147–8
                                       Renal tract see Kidneys
   liver transplants, 115                                                         splenic infarction, 146, 147
                                       Renal vein thrombosis (RVT)
   portal venous system, 24, 24, 25,                                              splenic vein thrombosis, 127,
                                          causes of renal tract obstruction,
       25, 26, 27                                                                     146–7, 248
                                             167
   thrombosis, 111–12, 127, 248                                                   splenomegaly, 103, 139, 139, 140,
                                          general information, 180–1, 191
Positioning the patient, 18                                                           146
                                          hydronephrosis, 168–9
Post-processing options, 3                                                        splenunculi, 139–41
                                          in neonates, 231, 231–2
Postoperative bile collection, 49                                                 trauma, 148
                                          ultrasound appearances, 181, 190
Postsurgical CBD dilation, 66–7                                                Staghorn calculi, 173
                                       Retroperitoneum
Power Doppler                                                                  Steatosis, 95–7
                                          abdominal aorta, 195–9
   diagnosing cholecystitis, 54                                                Stenosis, 114
                                          adrenal glands, 201–6
   general information, 4                                                      Stomach, 206
                                          gastrointestinal tract, 206–11
   liver transplant, 114                                                       Stones
                                          inferior vena cava, 199–201
   of the hepatic vein confluence, 5                                              bladder, 249
                                          normal anatomy of, 195
   thermal effects of, 11                                                         gallbladder, 28, 30, 247 (see also
                                          other abnormalities in, 212–13
Pre-eclampsia, 109–10                                                                 Gallstones)
                                       Rhabdomyosarcomas, 219–20, 234
Pregnancy, liver conditions in,                                                   renal, 167, 171–3, 172
                                       Rokitansky–Aschoff sinuses,
       109–10                                                                     struvite, 171
                                             51, 52
Primary biliary cirrhosis (PBC), 97,                                           Strawberry gallbladder, 53–4, 54
                                       Rupture, organ, 244
       98, 111, 112                                                            Stricture, renal tract, 167
Primary gallbladder carcinoma, 73,                                             Struvite stones, 171
       73                               S                                      Sub-scanning, 18
Primary sclerosing cholangitis
       (PSC), 67–8, 68, 69, 107,       Safety indices, 11
       111, 112                        Safety of diagnostic ultrasound,         T
Probe number, 7                               10–12
Processing options, 2                  Schemes of work, 13                     Techniques, ultrasound
Prostate enlargement, 167              Sclerosing cholangitis, 60, 218            adrenal glands, 201
Pseudoaneurysm, 148, 189               Secondary biliary cirrhosis, 98–9          bile ducts, 33
Pseudocysts, 125, 126, 132, 248,       Sepsis, 139                                paediatric abdomen, 215–16
       248                             Septum, gallbladder, 29                    pancreas, 121–3
Psoas abscesses, 250                   Shadowing, gallstones, 42–4, 42–4          renal tract, 154–7
Pulsed Doppler, 5, 11                  Sickle cell disease, 139, 146              upper-abdominal, 18
Pyelonephritis, 174–5, 176, 248        Simple cysts, 79–80, 80                 Teratomas, 213
Pyogenic abscess, 83, 83               Skills of the operator, 17              Thalassaemia, 139, 146
Pyonephrosis, 167, 169, 169            Small gallbladder, 49–50                Thermal effects of ultrasound, 11
                                       Small spleen, 139–40                    Thermal Index (TI), 11
                                       Soft tissue thermal index (TIS), 11     Thin patients, 30
 Q                                     Spectral Doppler, 115, 169              Thrombosis
                                       Spectral waveform, 5–6                     misinterpretation of results, 6
Quality assurance, 13–15               Spherocytosis, 139, 146                    portal vein, 100, 101, 111–12,
Quality of the image, 1–2              Sphincter dysfunction, 271                     127
284    INDEX


      Thrombosis (Continued)                 Tumours                               Vascular abnormalities of the spleen,
         renal vein thrombosis (RVT)           bladder, 4                                 146–8
            causes of renal tract              hepatic, 268–9                      Vascular occlusion, 187
                obstruction, 167               malignant bowel, 210–11             Vascular pathology, renal, 179–82
            general information, 180–1,        renal, 167                          Vascular tumours, 220
                189                            tumour seeding, 261                 VATER syndrome, 224
            hydronephrosis, 168–9              vascular, 220                       Veins see specific vein
            in neonates, 231, 231–2            see also specific tumour            Vesico-ureteric junction, 170
            ultrasound appearances, 181,                                           Vesicoureteric reflux, 226–9
                190                                                                Vessel occlusion, 6, 6
         splenic, 127, 248                    U                                    Viral hepatitis, 96, 106
         thrombosed vessels, 5–6                                                   Volvulus, 236–7, 237
      Time gain compensation (TGC), 28,      Ulcerative colitis, 209               Von Hippel–Lindau disease, 221
            96                               Ultrasound contrast agents, 266–8,
      Tissue Harmonic Imaging, 2, 4, 18,            268, 269
            28                               Ultrasound-guided biopsy               W
      Tissue-mimicking phantom, 14              complications, 261
      TORCH screen, 88                          general considerations, 253–7      Wilms’ tumour, 220, 229–30,
      Toxic shock syndrome, 111                 procedures, 257–61                      230–1, 231, 234
      Transitional cell carcinomas, 164–5,   Ultrasound-guided drainage, 261–4     Wilson’s disease, 99
            165, 166                         Upgradability of machines, 8          Work-related musculoskeletal
      Transjugular intrahepatic              Upper-abdominal anatomy, 36–9,             disorders (WRMSD), 8, 12
            portosystemic shunt (TIPS),             36–9                           World Federation for Ultrasound in
            105, 105–6, 106                  Upper-abdominal technique, 18              Medicine and Biology
      Transplants                            Ureteric obstruction, 248                  (WFUMB), 10
         hepatic, 110–17                     Urethral stricture, 167
         pancreatic, 135                     Uric acid stones, 171
         renal, 182–91, 183, 184             Urinary tract, 221–32, 248             X
      Trauma                                    see also Kidneys
         abdomen, 244–5                      Urine tests for renal function, 157   X-ray, 229
         pancreatic, 125, 134–5              Urinomas, 187                         Xanthogranulomatous pyelonephritis
         renal, 182                                                                       (XGP), 177, 177, 230–1, 231
         splenic, 148
      Tuberculosis, 111, 167, 175             V
      Tuberose sclerosis, 163
      Tubular necrosis, acute (ATN),         Varices, 103
            177–8, 189

								
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