title: Rectal metastasis of prostate cancer: about a case.
abstract: Prostate adenocarcinomas present a high risk of metastasis. We report a case of an atypical prostate cancer metastasis. A male patient presented a prostatic adenocarcinoma treated by surgery. A biological recurrence was discovered during the follow-up by an increased rate of Prostate Specific Antigen (PSA) and was treated by hormonotherapy. Several months later, there was a re-increase of the PSA rate. The CT scan showed a radiation proctitis aspect. An intermittent hormonotherapy was decided. Six months later, he presented abdominal pain. Examinations were performed and showed a rectal carcinosarcoma with prostate origins. A surgical management was realised. The outcomes were an early recurrence. A symptomatic treatment was decided. There are not any rectal localisations reported in the literature. Only loco-regional invasions of the rectum are described and no histological modification of metastasis compared to the primitive tumor has been reported. So, we report a metastasis of a prostate adenocarcinoma which transformed into a carcinosarcoma.
  
  
  BACKGROUND
  Adenocarcinoma; Carcinosarcoma; Metastasis; Prostate; Rectal neoplasm.
authors.affiliation: Digestive Surgery Department, chu Angers, 4 rue Larrey, 49000 Angers, France.
authors.forename: Aurelien
authors.initials: A
authors.lastname: Venara
authors.forename: Emilie
authors.initials: E
authors.lastname: Thibaudeau
authors.forename: Souhil
authors.initials: S
authors.lastname: Lebdai
authors.forename: Stephanie
authors.initials: S
authors.lastname: Mucci
authors.forename: Catherine
authors.initials: C
authors.lastname: Ridereau-Zins
authors.forename: Rahmene
authors.initials: R
authors.lastname: Azzouzi
authors.forename: Antoine
authors.initials: A
authors.lastname: Hamy