May Be Caused by

Ascaris

Brunner gland hyperplasia

Carcinoid

Carcinoma of duodenum or ampulla

Choledochal cyst

Choledochocele

Duplication

Duplication cyst

Ectopic pancreas

Flexure defect

Foreign body in lumen

Gallstone impaction at papilla

Gastroduodenal intussusception

Gastrointestinal stromal tumor

Hamartoma

Hemangioma

Intraluminal diverticulum

Intramural bowel hemorrhage

Islet cell tumor

Juxtaduodenal abscess

Kaposi sarcoma

Leiomyoma

Leiomyosarcoma

Lipoma

Lymphangioma

Melanoma

Mesenteric or celiac artery collateral

Myxoma

Neurofibroma

Normal papilla of Vater

Normal variant

Pancreatic mass

Papilla of Vater enlargement

Peptic ulcer with edema or deformity

Polyp

Postoperative defect

Prolapsed gastric mucosa or polyp

Prolapsed gastrostomy tube

Redundant duodenal fold

Renal cell carcinoma

Stitch abscess

Thrombus

Villous adenoma