Anal neoplasia. Pathogenesis, diagnosis, and management.

Prolonged, severe immunodeficiency provides the necessary milieu for the emergence of anogenital neoplasia caused by human papillomaviruses. Anal neoplasia is likely to become a more common manifestation of HIV disease as patients with profound immunodeficiency, who would have succumbed to opportunistic infections earlier in the epidemic, are now surviving for extended periods of time because of increasingly effective antiretroviral, prophylactic, and antimicrobial therapies. The screening and treatment strategies described for use in HIV-infected patients with anal neoplasia are currently being investigated and refined.