Anal dysplasia is a pre-cancerous condition which occurs when the lining of the anal canal undergoes abnormal changes. It can be classified as low-grade squamous intraepithelial lesions (LSIL) and high-grade squamous intraepithelial lesions (HSIL)  Most cases are not associated with symptoms, but people may notice lumps in and around the anus.
- Darragh, Teresa (October 2012). "The Lower Anogenital Squamous Terminology. Standardization Project for HPV-Associated Lesions:". Arch Pathol Lab Med 136: 1266-1297.
- Salit, Irving. "Fact Sheets: Anal dyspasia". Canadian Aids Treatment Information Exchange. Retrieved 2009-02-22.
- Palefsky, Joel M.; Holly, Elizabeth A.; Ralston, Mary L.; Jay, Naomi (February 1988). "Prevalence and Risk Factors for Human Papillomavirus Infection of the Anal Canal in Human Immunodeﬁciency Virus (HIV)–Positive and HIV-Negative Homosexual Men" (PDF). Departments of Laboratory Medicine, Stomatology, and Epidemiology Biostatistics, University of California, San Francisco. The Journal of Infectious Diseases Oxford University Press. Retrieved 2 March 2014.
- "CDC Fact Sheet - Incidence, Prevalence, and Cost of Sexually Transmitted Infections in the United States" (PDF). CDC. February 2013. Retrieved 2 March 2014.
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