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Imperforate anus


  • anus, imperforate
  • atresia, anal
  • atresia ani
  • congenital anal atresia


A congenital abnormality characterized by the persistence of the anal membrane, resulting in a thin membrane covering the normal anal canal. Imperforation is not always complete and is treated by surgery in infancy. This defect is often associated with neural tube defects; mental retardation; and Down syndrome.

Definition from: MeSH via Unified Medical Language SystemThis link leads to a site outside Genetics Home Reference. at the National Library of Medicine

See also Understanding Medical Terminology.

Published: February 1, 2016