Anal canal duplication associated with presacral cyst.

Anal canal duplications are rare congenital malformations, with fewer than 50 reported cases in the literature. Anal canal duplications are noncommunicating second anal orifices located posterior to the true anus without other associated hindgut duplications. Typically, these are asymptomatic, tubular malformations that present in females before the age of 6 years. Here, we report on a 16-year-old girl with a symptomatic anal canal duplication associated with a presacral cystic component. This is an unusual presentation of an already rare entity. An overview of the clinical presentation, radiologic workup, surgical treatment, and histologic features of anal canal duplications is provided.