Actinomycosis of the anorectal region.
D000196:Actinomycosis / Q000175:diagnosis / Q000473:pathology; D000368:Aged; D001004:Anus Diseases / Q000175:diagnosis / Q000473:pathology; D001706:Biopsy; D006801:Humans; D008297:Male; D008875:Middle Aged; D012002:Rectal Diseases / Q000175:diagnosis / Q000473:pathology; D012003:Rectal Fistula / Q000209:etiology