Rectal duplications are rare anomalies that may be lined with colonic (most common), squamous epithelium, gastric mucosa, and urothelial cells. The vast majority are retrorectal. Rectal duplications may be classified as:
- Tubular: Associated with urinary or vertebral malformations.
- Cystic: Associated with anorectal malformations, such as anterior perineal anus and cloacal malformations.
- Fistulated (internal or external):
- Diverticular:
- Exstrophic: May be attached to the rectum or vagina, but does not normally communicate with either.
The image above presents a rectal duplication. Contrast was administered through a mucous fistula, and filled the rectum and then a tubular retrorectal structure. The black dot represents a metallic marker at the site of an anus. The second image shows contrast trickling out around the region of what previously appeared to be an imperforate anus. The MR image shows a cystic structure posterior to the anus.
References
Rajah S, Ramanujam TM, Anas SR, Jayaram G, Baskaran P, Ganesan J, Tin M. Duplication of the rectum: report of four cases and review of the literature. Pediatr Surg Int. 1998 Jul;13(5-6):373-6.
Rectal duplications are rare anomalies that may be lined with colonic (most common), squamous epithelium, gastric mucosa, and urothelial cells. The vast majority are retrorectal. Rectal duplications may be classified as:
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