Gastric tissue in the rectum.
D002648:Child; D002828:Choristoma / Q000473:pathology*; D005753:Gastric Mucosa / Q000473:pathology*; D006471:Gastrointestinal Hemorrhage / Q000209:etiology; D006801:Humans; D008297:Male; D012005:Rectal Prolapse / Q000209:etiology; D012007:Rectum / Q000473:pathology*