The duodenum. Part 3: Pathology.

Duodenal pathology includes various developmental malformations and acquired lesions. This report provides brief descriptions of various congenital anomalies of the duodenum, including stenosis and atresia, annular pancreas and ectopic duodenal pancreatic tissue, megaduodenum, duodenal diverticula, preduodenal portal vein, and paraduodenal fossae. Acquired lesions, such as duodenal ulcer, tumors, vascular compression, and duodenal trauma are also described.