title: [Case of the month].
authors.affiliation: Chirurgische Klinik, Stadtspital Waid, Zürich.
authors.forename: P
authors.initials: P
authors.lastname: Buchmann
mesh_terms: D000328:Adult; D001004:Anus Diseases / Q000150:complications / Q000473:pathology*; D001005:Anus Neoplasms / Q000150:complications / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000150:complications / Q000473:pathology*; D003218:Condylomata Acuminata / Q000150:complications / Q000473:pathology*; D006679:HIV Seropositivity / Q000150:complications*; D006801:Humans; D008297:Male