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Imperforate Anus

Imperforate Anus: Between 4-6 weeks, the cloaca becomes the common depository for the developing urinary, genital and rectal systems. The cloaca is quite promptly divided into an anterior urogenital sinus and a posterior intestinal canal by the urorectal septum. Two lateral folds of cloacal tissue join the urorectal septum to complete the separation of the urinary and rectal tracts. Definition: Anorectal malformations are congenital defects where the anus (the opening at bottom where poo is passed) and rectum (the lower end of the digestive tract immediately above the anus) have not properly formed preventing faeces (poo) passing through the anus. It is not clear why this happens. It is a rare problem, occurring in 1 in 3000 babies and affects slightly more boys than girls. There are different types of anorectal malformations: • Imperforate anus - no anal (bottom) opening • Ectopic anus - small opening in the wrong place • Anal stenosis -narrow opening