Ulcerated ectopic gastric mucosa of the rectum.
D000293:Adolescent; D002828:Choristoma / Q000150:complications / Q000473:pathology* / Q000601:surgery; D005753:Gastric Mucosa; D006471:Gastrointestinal Hemorrhage / Q000209:etiology; D006801:Humans; D008297:Male; D012002:Rectal Diseases / Q000209:etiology; D012004:Rectal Neoplasms / Q000150:complications / Q000473:pathology* / Q000601:surgery; D014456:Ulcer / Q000473:pathology