A Case of Gastrointestinal Stromal Tumor of the Rectum Involving a Buttock Tumor

Jugo Sawada, Makoto Okazaki, Jun Yamamura, Yasuhito Kawasaki, Minoru Ohtsuru, Kiyoshi Kobayakawa, Seiji Yasuda and Yoshitake Hayashi^*

Department of Surgery, Koba Ekisaikai Hospital ^*First Department of Pathology, Kobe University

A 62-year-old man was admitted to our hospital due to a buttock tumor. After imaging examinations, the tumor was resected based on a diagnosis of myoma or sarcoma. At resection, the specimen was histologically diagnosed as gastrointestinal stromal tumor (GIST), malignant. A Miles operation was conducted following diagnosis. Histological examination of the resected specimen showed the tumor consisted of spindle-shaped cells. Immunohistochemical testing was negative for S-100, and positive for smooth-muscle actin, CD34, and c-kit, making this tumor a malignant smooth muscle GIST. Thereafter, 11 rectal GIST cases were reported in Japan. We reviewed the total of 12.

Key words
GIST, buttock tumor, rectal tomor

Reprint requests
Makoto Okazaki Department of Surgery, Kobe Ekisaikai Hospital 1-21-1 Manabigaoka, Tarumi-ku, Kobe, 655-0004 JAPAN

Accepted
June 26, 2001

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