[A case of early carcinoma of the remnant stomach that developed from gastritis cystica polyposa].

A 64-year-old man with an early carcinoma of the remnant stomach that developed from a gastritis cystica polyposa (GCP) is presented, and the morphology and histogenesis of this rare condition are discussed. This patient had a Billroth II reconstructed remnant stomach for 25 years, and was referred to our attention because of cholecystocholedocholithiasis. In screening an upper gastrointestinal barium study and an endoscopy revealed an irregular-shaped, flat, polypoid tumor in a stoma of the posterior wall. The resected polypoid lesion measured 4.5 x 3.0 cm. A histological examination revealed it to be a well differentiated adenocarcinoma of the mucosal layer that had developed from a GCP.