title: Metastatic prostate carcinoma mimicking primary anal cancer.
abstract: A 71-year-old man with a history of castration-refractory prostate cancer was initially treated with hormonal therapy. He responded with a decreasing prostate-specific antigen level and improved symptoms. Chemotherapy was initiated later, after an increasing prostate-specific antigen level and findings of distant metastases. Nine months after his initial diagnosis, he presented with a large multinodular perianal mass that was suspicious for primary anal cancer. Biopsy revealed poorly differentiated metastatic prostate carcinoma. The patient died 2 months after the initial presentation with perianal skin metastasis.
authors.affiliation: Department of Internal Medicine, State Univeristy of New York Downstate Medical Center, University Hospital of Brooklyn at Long Island College Hospital, Brooklyn, New York 11201, USA. iamval1208@yahoo.com
authors.forename: Valerie
authors.initials: V
authors.lastname: Kremer
authors.forename: Arye
authors.initials: A
authors.lastname: Kremer
authors.forename: Kiyanda
authors.initials: K
authors.lastname: Baldwin
authors.forename: Sandeep
authors.initials: S
authors.lastname: Sirsi
authors.forename: Amer
authors.initials: A
authors.lastname: Rafiaa
mesh_terms: D000368:Aged; D001005:Anus Neoplasms / Q000473:pathology* / Q000556:secondary*; D002277:Carcinoma / Q000473:pathology* / Q000556:secondary*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D011471:Prostatic Neoplasms / Q000473:pathology*