Intraluminal duodenal ("windsock") diverticulum: a rare cause of biliary obstruction and acute pancreatitis in the adult.

An intraluminal duodenal diverticulum (IDD) is a rare congenital anomaly, which is a result of incomplete recanalization of the foregut lumen during embryonic development. Most patients are asymptomatic. Symptoms usually occur after the third decade of life and mainly include epigastric pain, nausea, vomiting, or bloating.