Definition: a remnant of the proximal part of the yolk stalk within the embryo that arises as a fingerlike diverticulum, 3–6 cm long, from the antimesenteric border of the ileum between 40 and 50 cm from the ileocecal junction; it may be attached to the umbilicus. If its mucosa includes gastric tissue, peptic ulceration and bleeding may result.
Synonym(s): Meckel diverticulum
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