anal canal duplication
Anal canal duplication is the most distal and the least frequent digestive duplication. It is a congenital developmental lesion located in the midline posterior to the anus presenting as a tubular structure without communication with the anal canal, usually discovered in early infancy, and characteristically predominant in girls.
Synopsis
small opening just posterior to the anus in the midline
tubular structure
squamous epithelium
pseudostratified coumnar epithelium
anal ducts of Hermann and Desfosses
+/- smooth muscle bundles
Associations
sacral dysgenesis (Currarino syndrome or Currarino triad)
- presacral sacrococcygeal teratoma (11475116)
- lumbosacral myelomeningocele (11475116)
dermoid cysts
ureteral duplication
lumbosacral myelomeningocele (lumbosacral meningocele)
spina bifida
cleft lip/cleft palate
cardiac malformations
intestinal malrotation
Differential diagnosis
perianal sinus
rectal duplication
See also
References
Choi SO, Park WH. Anal canal duplication in infants. J Pediatr Surg. 2003 May;38(5):758-62. PMID: 12720188
Ochiai K, Umeda T, Murahashi O, Sugitoh T. Anal-canal duplication in a 6-year-old child. Pediatr Surg Int. 2002 Mar;18(2-3):195-7. PMID: 11956798
Jacquier C, Dobremez E, Piolat C, Dyon JF, Nugues F. Anal canal duplication in infants and children?a series of 6 cases. Eur J Pediatr Surg. 2001 Jun;11(3):186-91. PMID: 11475116