Solitary intrinsic duodenal mass

Common: Brunner gland hyperplasia; Carcinoid; Ectopic pancreas; Flexure defect; Hamartoma; Hemangioma; Islet cell tumor; Leiomyoma; Lipoma; Lymphangioma; Melanoma; Myxoma; Neurofibroma; Normal papilla of Vater; Normal variant; Pancreatic mass; Papilla of Vater enlargement; Peptic ulcer with edema or deformity; Polyp; Prolapsed gastric mucosa or polyp; Redundant duodenal fold; Renal cell carcinoma; Villous adenoma
Uncommon: Ascaris; Carcinoma of duodenum or ampulla; Choledochal cyst; Choledochocele; Duplication; Duplication cyst; Foreign body in lumen; Gallstone impaction at papilla; Gastroduodenal intussusception; Gastrointestinal stromal tumor; Intraluminal diverticulum; Intramural bowel hemorrhage; Juxtaduodenal abscess; Kaposi sarcoma; Leiomyosarcoma; Mesenteric or celiac artery collateral; Postoperative defect; Prolapsed gastrostomy tube; Stitch abscess; Thrombus