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Definition of Atresia, anal

Atresia, anal: Congenital absence of an opening at the bottom end of the intestinal tract. Also called imperforate anus. Occurs in about 1 in 5,000 births. It is corrected by surgery.

Atresia refers to the absence of a normal opening.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=16240
Last Editorial Review: 6/14/2012

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