(Case 1) A 70-year-old man was admitted to our hospital because of abdominal distension. An abdominal computed tomography scan showed a large cystic mass of the stomach. The patient was diagnosed as having a submucosal tumor of the stomach and was operated on. (Case 2) A 59-year-old man was admitted to our hospital because of melena. An abdominal computed tomography scan and ultrasonography showed a mass of the small bowel. Partial resection of the jejunum was performed with a diagnosis of small-bowel tumor. During laparotomy in both cases, a large number of small nodules of peritoneum were noted. Histologically, and immunohistochemically, both of the tumors were diagnosed as gastrointestinal stromal tumors (GIST), uncommitted type, with peritoneal dissemination. The prognosis of GIST with unresectable peritoneal dissemination is poor, therefore, surgical resection should be done as soon as possible.
Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association)