[Gastric diverticulum invaded by carcinoma].

Diverticulum of the gastric body is uncommon and the coexistence of this lesion and gastric carcinoma much more. The authors report a case of diverticulum and carcinoma of the gastric body in a 66-year-old woman. The partially resected stomach exhibited a diverticulum, 3 X 3 X 2 cm in size, on the lesser curvature and a carcinoma of the depressed type on the posterior wall. The latter was IIc + III-like advanced carcinoma showing poor differentiation histologically and partly invading the diverticular wall, which had no muscular layer (i.e., pseudo-diverticulum). As for pseudodiverticulum, carcinoma cells invading the submucosa will reach the serosa easily. It is important not to overlook carcinomas in or around the diverticulum.