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Imperforate anus

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Imperforate anus is a congenital cause of intestinal obstruction, bladder and sexual dysfunction. Its describes a spectrum of abnormalities affecting the anorectal area. The anus of the newborn baby must be always checked for the presence patency in the neonatal examination.

Imperforate anus affects 1 in 4000 new babies. In males, the most frequent abnormality is imperforate anus with a recto-urethral fistula, followed by perineal and rectovesical forms. In females, rectovestibular fistula is most common followed by perineal fistula with persistent cloaca. In 5% of cases there is no fistula. There is a higher than average incidence of other congenital malformations, for example, oeosphageal atresia.

The risk of a couple with one affected child having a second child with imperforate anus is about 1%.


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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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