Anus, Imperforate


MSH: 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.,NCI: A congenital birth defect characterized by the absence of a normal anal opening. It may be associated with other congenital abnormalities.

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