- 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 System at the National Library of Medicine
See also Understanding Medical Terminology.