Although the greater omentum is frequently the site of metastatic neoplasm, primary omental tumors are exeedingly rare. The authors report here, a cases of primary omental leiomyosarcoma presented initially as a palpable abdominal mass and
epigastic
discomfort for one year in a 66 year-old male patient. At laparotomy, 21×15×2.5cm mass weighing 600 gram was found in the omentum which was adherent to the anterior wall of the lower body of the stomach and liver surface. In the histologic
findings
presence of tumor necrosis, increased cellularity, cellular atypia and pleomorphismas well as large size of mass were indicative of leiomyosarcoma. Surgical resection has been known to be the principie treatment for this disease. In this cases,
excision
of the tumor with omentectomy, radical subtotal gastrectomy and wedge resection of the liver were performed. Eight months later, a recurrence was detected and chemotherapy with doxorubicin, dacarbazine, vincristine, and cyclophosphamide was done.
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