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  • Title: [Morphologic studies in swine with anal atresia].
    Author: Lambrecht W, Lierse W.
    Journal: Z Kinderchir; 1987 Dec; 42(6):350-1. PubMed ID: 3439356.
    Abstract:
    33 piglets with anorectal malformations were investigated histologically. 24 animals were male, 9 female. 18 piglets had high deformities with recto-urethral, respectively recto-vaginal fistulas. 15 animals had low deformities. In all animals we were able to demonstrate a sphincter internus muscle and a sphincter externus muscle. The sphincter internus muscle was localised around the fistula. These fistulas also had other characteristics of a normal anal opening.
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