Duplication of the small intestine.
D006801:Humans; D007421:Intestine, Small / Q000002:abnormalities*; D007422:Intestines; D008467:Meckel Diverticulum / Q000150:complications*; D010437:Peptic Ulcer / Q000209:etiology*
INTESTINE, SMALL/abnormalities; MECKEL'S DIVERTICULUM/complications; PEPTIC ULCER/etiology and pathogenesis