Published online by Cambridge University Press: 06 June 2020
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.
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