Hendren W H
J Pediatr Surg. 1978 Oct;13(6):505-12. doi: 10.1016/s0022-3468(78)80315-7.
Slight anterior displacement of the anus is a common developmental abnormality that represents the mild end of the imperforate anus spectrum. This malformation is a common cause of constipation. This type of constipation can be cured by posterior anoplasty. An experience is described in 134 cases who were operated upon from 1960 through 1977.