A Case of Gastrointestinal Stromal Tumor in the Lesser Omentum

Kazutomo Kitagawa, Morio Shirasu, Nobuo Kaneshiro, Yuji Yoshioka, Norikazu Kikuoka, Hiroki Taniguchi¹⁾ and Hidetoshi Okabe²⁾

Department of Surgery, Kyoto Kujo Hospital
¹⁾Department of Surgery, Kyoto Prefectural Yosanoumi Hospital
²⁾Department of Laboratory Medicine, Shiga University of Medical Science

A 60-year-old woman followed up for type C chronic hepatitis and found to have an abdominal mass 3 cm 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 well-circumscribed mass with solid and partially cystic cut surface, 3.2×3.0×2.8 cm. 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 low-malignancy gastrointestinal stromal tumor (GIST) of the lesser omentum. The patient remains free from recurrence 23 months after surgery.

Key words
gastrointestinal stromal tumor, c-kit, lesser omentum

Reprint requests
Kazutomo Kitagawa Department of Surgery, Kyoto Kujo Hospital
10 Karahashirajomon-cho, Minami-ku, Kyoto 601-8453 JAPAN

Accepted
January 28, 2004

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