title: Malignant melanoma presenting as peri-anal abscess.
mesh_terms: D000038:Abscess / Q000175:diagnosis*; D001004:Anus Diseases / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008545:Melanoma / Q000175:diagnosis*; D008875:Middle Aged; D012004:Rectal Neoplasms / Q000175:diagnosis*