title: Retroperitoneal müllerian carcinosarcoma associated with endometriosis: a case report.
abstract: BACKGROUND
  Mixed müllerian tumors are rare malignancies of the female genital tract and extremely uncommon in extragenital sites.
  
  
  METHODS
  A 71-year-old woman presented with a 3-month history of left-sided pelvic pain. Significant history included total abdominal hysterectomy and bilateral adnexectomy performed 19 years earlier for benign indications; she had no history of endometriosis. Bimanual exam and pelvic ultrasonography demonstrated a 6 x 5 x 6 cm complex mass in the left pelvis. Exploratory laparotomy revealed a retroperitoneal mass encasing the left ureter. The mass was debulked, necessitating resection of the distal ureter and ureteroneocystotomy. Histopathology demonstrated carcinosarcoma associated with endometriosis.
  
  
  CONCLUSIONS
  Extragenital carcinosarcoma is a rare malignancy, with only one well-documented case associated with peritoneal endometriosis. We report a case of an extragenital retroperitoneal carcinosarcoma associated with endometriosis.
authors.affiliation: Department of Obstetrics and Gynecology, Walter Reed Army Medical Center, Washington, DC, USA.
authors.forename: Christine
authors.initials: C
authors.lastname: Booth
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Zahn
authors.forename: John
authors.initials: J
authors.lastname: McBroom
authors.forename: G Larry
authors.initials: GL
authors.lastname: Maxwell
mesh_terms: D000368:Aged; D002296:Carcinosarcoma / Q000150:complications / Q000473:pathology*; D004715:Endometriosis / Q000150:complications*; D005260:Female; D006801:Humans; D018200:Mixed Tumor, Mullerian / Q000150:complications / Q000473:pathology*; D012186:Retroperitoneal Neoplasms / Q000150:complications / Q000473:pathology*