Abstract
A 62 year-old-man was admitted to our hospital with pancreatitis in 2012. On admission, endoscopy was performed and a polyp that seemed derived from the dundenum was observed. The patient discontinued his hospital visits for a while but on his revisit in 2015, enlargement of the polyp as observed by CT compared to his previous examination was apparent. Distal gastroduodenectomy was performed. The resected specimen derived from the gastric antrum revealed prolapse of the polyp head into the duodenum, and the pathological diagnosis was gastric mucosal prolapse polyp (GPP) . GPP tends to prolapse into the duodenum. It is therefore important for the clinician to consider GPP in the differential diagnosis of duodenal tumors.
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