Meckel’s diverticulum

Meckel’s diverticulum

An outpouching in the small intestine, which corresponds to the omphalomesenteric or vitelline duct remnant located along the antimesenteric border. Meckel’s diverticula may contain gastric tissue and be associated with peptic ulcer disease (ulceration), perforation or pancreatic tissue, or may be linked to small bowel obstruction.
 
A popular mnemonic is the “rule of twos”, as Meckel’s diverticula are 2 feet (roughly 0.65 m) from the ileocecal valve, 2 inches long (roughly 5 cm), 2 cm in diameter, found in 2 % of the population, and two-fold more common in men. Because Meckel’s diverticula are favoured site for carcinoids, it may be excised prophylactically when the surgeon is operating in the abdominal cavity for other reasons.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.