Congenital anomalies


Topic Completed: 1 March 2014

Minor changes: 30 September 2020

Copyright: 2003-2021,, Inc.

PubMed Search: Colon[title]Atresia

Hanni Gulwani, M.B.B.S.
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Cite this page: Gulwani H. Atresia. website. Accessed October 28th, 2021.
Definition / general
  • Imperforate mucosal diaphragm or stringlike segment of bowel
  • Very rare (1 per 20,000 live births)
  • Associated with other congenital anomalies, including Hirschsprung disease
  • May have genetic (J Pediatr Surg 2005;40:390) or vascular cause
  • Type 1: bowel and mesentery are intact, but bowel lumen is interrupted by a complete membrane
  • Type 2: bowel is discontinuous, connected by a fibrous cord
  • Type 3: bowel ends are completely separated and mesentery has a gap
Clinical images

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Type I atresia: mucosal septum

Atresia with hugely distended cecum

Atresia Type I

Gross images

Contributed by Dhiraj B. Nikumbh, M.D.

Congenital pouch colon

Microscopic (histologic) images

Contributed by Dhiraj B. Nikumbh, M.D.

Congenital pouch colon: 10 day old baby boy admitted with abdominal distension and absent anal opening

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