title: Anorectal cancer masquerading as benign perianal disease: case reports.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis; D001005:Anus Neoplasms / Q000175:diagnosis*; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D005401:Fissure in Ano / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012002:Rectal Diseases / Q000175:diagnosis*; D012003:Rectal Fistula / Q000175:diagnosis; D012004:Rectal Neoplasms / Q000175:diagnosis*