• A congenital abnormality characterized by the outpouching or sac formation in the ILEUM. It is a remnant of the embryonic YOLK SAC in which the VITELLINE DUCT failed to close.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• A congenital pouch in the distal ileum. It may cause painless rectal bleeding and bowel obstruction.
  NCI
  U.S. National Cancer Institute, 2021
• Meckel's diverticulum is a congenital diverticulum located in the distal ileum.
  Human Phenotype Ontology (HPO)
  The Human Phenotype Ontology Project, 2025
• Meckel diverticulum is a true diverticulum and is the most common congenital anomaly of the gastrointestinal tract, occurring in about 2% of people. It is caused by incomplete obliteration of the vitelline duct and consists of a congenital sacculation of the antimesenteric border of the ileum. It is usually located within 100 cm of the...
  Merck Manuals
  Merck & Co., Inc., 2025
• A Meckel diverticulum is a vestigial remnant of the omphalomesenteric (vitellointestinal) duct. As a congenital anomaly, it is a true diverticulum that includes all three coats of the small intestine.
  Medscape
  WebMD, 2025
• The most common congenital malformation of the small bowel, Meckel diverticulum (MD) is present in 1% to 3% of the population. It is a true diverticulum that results from the failure of the vitelline duct to obliterate during the fifth week of fetal development. Patients are often asymptomatic. However, this embryologic remnant may cause...
  Epocrates
  Athenahealth, Inc., 2019