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Atresia ani in dogs
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Large animal practitioners see this congenital anomaly sometimes in piglets. In dogs, atresia ani is very rare. This interesting retrospective study gives interesting informations concerning this problem in dogs. Did you know that females are overrepresented and that especially toy poodles and Boston terriers belong to the breeds at risk?
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Congenital anomalies of the rectum and anus are rare in dogs. The most frequently reported anomaly is atresia ani.
Four types of atresia ani have been reported, including congenital anal stenosis (Type I); imperforate anus alone (Type II) or combined with more cranial termination of the rectum as a blind pouch (Type III); and discontinuity of the proximal rectum with normal anal and terminal rectal development (Type IV).
An increased incidence was found in females and in several breeds, including miniature or toy poodles and Boston terriers.
Surgical repair is the treatment of choice, but postoperative complications can occur, including fecal incontinence and colonic atony secondary to prolonged preoperative distension.
Source: Maria L. Vianna, Karen M. Tobias (2005): Atresia Ani in the Dog: A Retrospective Study. In: Journal of the American Animal Hospital Association 41:317-322 (2005)
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