Tubular anal duplication--experiences with two cases.

Anal duplication is a very rare abnormality, especially in infants. Two cases of tubular anal duplication of the infant and neonate are reported in this paper. In all cases, removal of the duplicated anus through the perineal approach was accomplished without difficulty. The histology revealed a squamous epithelium with smooth muscle component around the cavity, combined with collumnar or transitional epithelium. There was no evidence of inflammation. The postoperative courses were uneventful with satisfactory anal function. The definite aetiology of this condition is still unknown, although several hypotheses have been proposed.