A Case of Early Gastric Cancer in the Mucosa Just Above a Gastric Leiomyosarcoma

Kinya Matsumoto, Hiroshi Kuninobu, Sunao Otagaki, Fumio Shimamoto*

Department of Surgery, Kure Saiseikai Hospital
*Department of Pathology, Kure Kyousai Hospital

A case of early gastric cancer that developed from a hyperplastic polyp on a gastric leiomyosarcoma is reported. A 66-year-old man complained of general fatigue and tarry stools, and blood examination revealed severe anemia. An upper gastrointestinal series and gastroendoscopic examination revealed a reddish polypoid lesion, 5 cm in diameter situated just above the submucosal tumor on the posterior wall of the middle body of the stomach. A gastric leiomyosarcoma was consequently suspected and a subtotal gastrectomy was performed. In histological findings, the submucosal tumor was a leiomyosarcoma and the polypoid lesion was a hyperplastic polyp consisting of dysplastic foci with malignant transformation. Each lesion grew independently of the other. There has been no report in Japan of an early gastric cancer developing from a hyperplastic polyp on a gastric leiomyosarcoma, and this case was interesting from the viewpoint of histogenesis of malignant transformation of hyperplastic polyps.

Key words
gastric leiomyosarcoma, early gastric cancer, hyperplastic polyp

Reprint requests
Kinya Matsumoto Department of Surgery, Kure Saiseikai Hospital
2-1-13 Sanjo, Kure, 737 JAPAN

Accepted
April 1, 1992

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