Abstract
A 60-year-old woman followed up for type C chronic hepatitis and found to have an abdominal mass 3cm in diameter in the lesser omentum 9 months earlier underwent elective laparotomy in November 2001 to excise the tumor despite the absence of change in tumor size. The tumor was isolated from the stomach and well encapsulated and did not adhere to adjacent organs, allowing complete removal. The tumor was a wellcircumscribed mass with solid and partially cystic cut surface, 3.2×3.0×2.8cm. Histologically, it consisted of spindle cells and mitotic counts of less than 5 per 50 high-power fields. Immunohistochemically, it was positive for c-kit and CD34 but negative for alpha-smooth muscle actin and S-100. The pathological diagnosis was lowmalignancy gastrointestinal stromal tumor (GIST) of the lesser omentum. The patient remains free from recurrence 23 months after surgery.
