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Anus and perianal area

Benign or non-neoplastic lesions

Tailgut cyst


Reviewer: Nat Pernick, M.D. (see Reviewers page)
Revised: 15 April 2013, last major update April 2005
Copyright: (c) 2003-2013, PathologyOutlines.com, Inc.

General
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● Rare congenital presacral lesion
● Also called retrorectal cyst hamartoma
● May arise from remnants of postanal gut (tailgut)
● Usually occurs in retrorectal (presacral) space of all ages, more common in females, associated with pain/discomfort
● May become infected, be associated with recurrent perianal fistulas
● Rarely associated with malignancy

Case reports
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● 41 year old woman with carcinoid tumor arising in a tailgut cyst of anorectal junction with distant metastasis (Arch Pathol Lab Med 2004;128:578)

Treatment
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● Complete excision with free margin of normal tissue, generous sampling

Micro images
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Cyst with carcinoid tumor

Differential diagnosis
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● Anal gland cyst
● Anterior sacral meningocele
Dermoid cyst
● Duplication (enterogenous) cyst
Teratoma

End of Anus and perianal area > Benign or non-neoplastic lesions > Tailgut cyst


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