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Chapter 27 - Non-Neoplastic Diseases of the Anal Canal

Published online by Cambridge University Press:  06 June 2020

By
Morgan Moorghen
Edited by
Roger M. Feakins
Roger M. Feakins
Affiliation:
Royal Free London NHS Foundation Trust, London, UK
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Summary

The most common non-neoplastic conditions in the anal canal include haemorrhoids, fissures, fibroepithelial polyps and associated abscesses, manifestations of Crohn’s disease, human papilloma virus infection, and other sexually transmitted infections (some of which are secondary to HIV). Several dermatoses that are not site-specific may also involve the anal canal and perianal areas. These include eczema, psoriasis, lichen planus, lichen sclerosus, acanthosis nigricans, and hidradenitis suppurativa. Non-neoplastic polypoid lesions may occur, and these include condylomata acuminata and inflammatory cloacogenic polyps. Congenital abnormalities include imperforate anus and anal duplication. The former rarely, if ever, comes to attention of the histopathologist whereas the latter is occasionally encountered.

Keywords

anal canalhemorrhoidspolypfistulahuman papilloma virusdermatosiscongenital abnormalities
Type
Chapter
Information
Non-Neoplastic Pathology of the Gastrointestinal Tract
A Practical Guide to Biopsy Diagnosis
 , pp. 434 - 445
Publisher: Cambridge University Press
Print publication year: 2020

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