Duodenal narrowing or obstruction

Common: Choledochal cyst; Congenital atresia; Duodenal diaphragm; Duodenal web; Extrinsic mass; Liver neoplasm; Mesenteric lymphadenopathy; Neoplasm of colon; Neoplasm of kidney; Neoplasm of major bile duct; Pancreatic pseudocyst; Para-aortic lymphadenopathy; Postbulbar duodenal scar; Postbulbar duodenal ulcer; Stenosis; Superior mesenteric artery syndrome; Trisomy 21
Uncommon: Adhesions; Amebic liver abscess; Annular pancreas; Aorticoduodenal fistula; Ascaris bolus; Burkitt lymphoma; Carcinoma of ampulla of Vater; Carcinoma of duodenum; Cholecystitis; Congenital peritoneal bands; Crohn disease; Duodenal stricture; Duplication cyst; Gallstone impaction; Giardiasis; Hematoma; Hydatid disease; Idiopathic pseudo-obstruction; Inflammatory disease of duodenum; Internal hernia; Intraluminal diverticulum; Leiomyosarcoma; Metastatic neoplasm of duodenum; Midgut volvulus with malrotation; Paraduodenal hernia; Preduodenal portal vein; Primary neoplasm of duodenum; Prolapsed gastric lesion; Prolapsed gastric polyp; Strongyloidiasis; Tuberculosis