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| Anus, Imperforate Anal Atresia | Atresia, Anal | Anal Atresias | Atresias, Anal | Imperforate Anus Persistence of the anal membrane, so that the anus is closed. The defect is not always complete; sometimes a narrow opening permits the passage of the bowel contents. When completely imperforate, the anus is seen as a dimple (the proctodeal pit) in the skin of the perineum. The latter condition is often associated with atresia of the lower rectum. (Dorland, 27th ed) |