We experienced a case of early gastric carcinoma prolapsing into the duodenum. A 81 year-old woman was admitted to the hospital with vomiting and dizziness. Endoscopic examination revealed prolapse of the tumor through the pylorus to the duodenum, and the tumor replaced back to the stomach. Histlogical examination of the specimen biopsied from the tumor revealed Group IV, therefore we diagnosed it as an early gastric carcinoma. Distal gastrectomy with lymphadectomy was performed. A size of the tumor was 75×40mm. Histological diagnosis was well differentiated adenocarcinoma of stomach limiting within mucosa with lymph node metastasis. Post operative course was uneventful and she was discharged on postoperative day 21.
