Meckel diverticulum
Most common congenital abnormality of the small intestine, representing a remnant of the omphalomesenteric duct.
Full Definition
Meckel diverticulum is a true diverticulum of the small intestine that occurs in approximately 2% of the population. It results from incomplete obliteration of the omphalomesenteric duct during fetal development. The diverticulum is typically located on the antimesenteric border of the ileum, about 2 feet from the ileocecal valve. It may contain ectopic gastric or pancreatic tissue, which can lead to complications such as bleeding, obstruction, or perforation. The condition follows the 'rule of twos': 2% prevalence, 2 feet from the ileocecal valve, 2 inches long, and symptomatic in the first 2 years of life.
Usage
Usage note: Capitalize 'Meckel' as it's an eponym; the possessive form 'Meckel's' is also acceptable.
In Context
- "The technetium scan was positive, confirming the presence of a Meckel diverticulum with ectopic gastric mucosa." — Nuclear medicine report
- "Laparoscopic diverticulectomy was performed for the symptomatic Meckel diverticulum." — Surgical procedure note