Cystic Sarcoma of the Psoas Muscle Masquerading as Appendicitis by ProQuest

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Soft tissue sarcomas account for less than 1 per cent of all cancers.1 Approximately 10,400 new cases are reported each year in the United States.1 Most cases of sarcoma have no identifiable cause, but known risk factors include radiation exposure, infection with Epstein-Barr virus, and a history of neurofibromatosis type I. l Sixty per cent of sarcomas arise in the upper or lower limbs followed by 20 per cent in the retroperitoneum.1 The iliopsoas compartment is one of the most inaccessible areas in the area of soft tissue tumor surgery.2 The iliopsoas muscle is comprised of the iliacus and psoas muscles. CT is preferred for intra-abdominal or retroperitoneal masses, and it is also used for detecting pulmonary metastases.3 MRI is used for tumors in the upper and lower limbs because it offers better soft tissue differentiation.3 In the absence of metastatic disease, wide surgical resection is the mainstay of treatment.

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