Ectopic Gastric Mucosa in Rectum: A Rare Cause of Rectal Bleeding in Children.Menchaca Marines, Mario C.; Posselt, Hans-Georg; Waag, Karl LudwigJournal of Pediatric Gastroenterology & Nutrition: March/April 1988 Case Report: PDF Only Abstract Summary: A 3-year-old boy with rectal bleeding and colicky abdominal pain is described in whom heterotopic gastric mucosa in the rectum was found. Increased uptake of 99mTc-pertechnetate was demonstrated in two sites: rectum and left colon. However, gastric mucosa could be identified by endoscopic and histologic examination in the rectum only. The patient was asymptomatic after the operation and during follow-up, over 14 months. (C) Lippincott-Raven Publishers.