A Giant Hyperplastic Polyp of the Stomach Complicated by Gastric Outlet Obstruction and Superficial Transition to Adenocarcinoma

Abstract

Gastric hyperplastic polyps (GHP) represent the most common type of gastric polyps, usually less than 2 cm, and have a very low malignant potential. We present a very rare case of a giant hyperplastic polyp with a superficial transition to adenocarcinoma (carcinoma in situ), arising from the untypical subcardial part of the stomach and prolapsed through the pylorus into the horizontal part of the duodenum, causing anaemia and a completely obstruction of the duodenal lumen with gastric outlet syndrome. Due to the giant size of the semi-pedunculated polyp and high malignant potential of this polyp, we preferred the surgical treatment of the patient. During the operation, we additionally observed enlarged and phlegmonously altered locally complicated gallbladder, which was not diagnosed before. We performed cholecystectomy and partial resection of the posterior wall of the stomach, followed by no complications in the postoperative period.