Background: Adenomatous polyps of the stomach are rare and usually found on routine endoscopic examination. Gastroduodenal intussusception is a rare complication of gastric polyps and it has been rarely described as a cause of acute pancreatitis. A review of the literature on the subject is provided.
Case Report: The authors report the case of a patient with an adenomatous gastric polyp that prolapsed into the duodenum and caused acute pancreatitis. She was submitted to surgical resection and is presently well, with no evidence of recurrence.
Conclusions: Prolapsed polyps of the stomach should be included in the differential diagnosis of secondary pancreatitis. These polyps should be removed because of their potential for malignant transformation. Endoscopic polypectomy is the preferred treatment modality, but surgery is required to resect large polyps.

Keywords: stomach polyps, gastric polyps, acute pancreatitis, pancreatitis aetiology