Ectopic gastric mucosa.
D000368:Aged; D002828:Choristoma / Q000175:diagnosis*; D004379:Duodenal Neoplasms / Q000175:diagnosis*; D004724:Endoscopy; D005260:Female; D005753:Gastric Mucosa; D006801:Humans; D008297:Male; D008875:Middle Aged