Chapter 6 Neoplasia

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Chapter 6 Neoplasia Powered By Docstoc
					          Section 6

How to distinguish benign and
      malignant tumors
          Comparisons between benign and
                  malignant tumors

                         Benign           Malignant

Differentiation           Well       Poor or lack


Mitoses           Few      or     no Always, have pathologic
                  pathologic mitoses mitoses

Growth rate       Slow               Rapid


Secondary changes Less bleeding and Common in bleeding and
                  necrosis          necrosis
        Comparisons between benign and
                 malignant tumors

                        Benign            Malignant

Growth pattern   Expansive or exotexic Invasive or exotexic
                 have envelope         no envelop

Metastasis       No                    Often


Recurrence       Rare                  Always

Affection        Mainly local oppress Great, destruction,
                 and obstruction      bleeding, infection,
                                      pain, cachexia
Annotation
1. Above comparisons are relative, i.g. Angioma
  is benign, but invasion growth, carcinoma of
  base cell is malignant, but rare metastasis.
2. Some boundary tumors are between benign
  and malignant.
3. Some benign tumors may change to
  malignant
4. There are different malignant level of
  different malignant tumors.
Comparisons between benign and malignant
    (Quoted from Robbins《 Pathology Basis of disease》)

				
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