Abdominal primary extra-gastrointestinal stromal tumor (EGIST). A cytologic diagnosis in ascitic fluid.

Dear Editor, We present a case of a primary abdominal Extra-gastrointestinal stromal tumor (E-GIST) in a75 years old female patient. E-GISTs are rare, non-epithelial, mesenchymal tumors arising from the soft tissues of the abdomen - mesentery and retroperitoneum. These tumors are histologically and cytologically similar to the stromal tumors of gastrointestinal tract, composed of round or fusiform cells or a mixture of both in a myxoid background. The recognition of these tumors is important because of their aggressive biological behavior, the metastatic potential and the high rate of recurrence.