Abstract
We report a case of type 1 advanced gastric cancer which caused ball valve syndrome. An 88-year-old man was admitted because of vomiting after eating. Endoscopic examination revealed a transpyloric prolapse caused by a type 1 gastric cancer. Using the intrabulbar retroflexion method, the whole course of the prolapsed gastric cancer into the duodenal bulb could be easily observed, and an accurate diagnosis could be easily made. The cancer was pushed back into the stomach ; endoscopic submucosal dissection was performed. However, the cancer had infiltrated the muscle layer of the stomach. Therefore, a distal gastrectomy was performed. The tumor was a type 1 tumor 50×45 mm in diameter located in the antrum of the stomach. Histological examination showed moderately differentiated adenocarcinoma infiltrating into the muscle layer of the stomach wall. We report this case along with an analysis of 35 cases of gastric cancer prolapsing into the duodenum reported from 1983 to 2010 in Japan.
