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Primary Extragastrointestinal Stromal Tumor of the Sigmoid Mesocolon with Metastatic Spread to Greater Omentum : Case Report

A 71-year-old female complained of abdominal pain, weight loss and abdominal distension. Gynecologic examination revealed a hardly movable, palpable mass in the lower abdomen, reaching the umbilicus. An abdominal ultrasound and computed tomography (CT) scan suggested a large abdominal mass with the possible origin in the left ovary and without significant lymph node enlargements. The patient subsequently underwent complete evacuation of tumor tissue, omen- tectomy and total abdominal hysterectomy and bilateral salpingo-ovariectomy. Immunohistochemical examination re- vealed strongly positive staining of tumor cells for CD117. The final pathologic diagnosis was a primary extragastro- intestinal stromal tumor (EGIST) of the sigmoid mesocolon with omental metstasis. The differential diagnosis of the tumor presented in the lower abdomen should consider the EGIST as well.

immunohistochemistry; CD117; metastasis

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