title: Long term survival in a case of concurrent retroperitoneal liposarcoma and renal cell carcinoma: a case report.
abstract: BACKGROUND
  Liposarcoma is one of the most common soft tissue sarcomas found in adults. It has a predilection for retroperitoneal space. Renal cell carcinoma is the most common tumor of the kidney.
  
  
  METHODS
  Concurrent retroperitoneal liposarcoma and renal cell carcinoma were found in a 34-year-old Japanese man. The renal tumor was first detected by ultrasonography, it was confirmed by computed tomography, which also identified a presumptive retroperitoneal liposarcoma, and the tumors were further assessed with magnetic resonance imaging. The patient was treated by surgical resection of retroperitoneal liposarcoma and left nephrectomy and has been disease-free for 10 years.
  
  
  CONCLUSIONS
  The concomitant occurrence of a renal tumor and a primary primary liposarcoma is rare. The major factors promoting a good prognosis in this case were the favorable histology and the small size of the tumors.
authors.forename: Senji
authors.initials: S
authors.lastname: Hoshi
authors.forename: Natuho
authors.initials: N
authors.lastname: Hayashi
authors.forename: Mayu
authors.initials: M
authors.lastname: Yagi
authors.forename: Teppei
authors.initials: T
authors.lastname: Ookubo
authors.forename: Akinori
authors.initials: A
authors.lastname: Muto
authors.forename: Osamu
authors.initials: O
authors.lastname: Sugano
authors.forename: Kenji
authors.initials: K
authors.lastname: Numahata
authors.affiliation: Department of Urology, Niigata Cancer Center Hospital, Kawagishi-cho 2-15-3, Chuo-ku, Niigata-shi 951-8566, Japan. vbilim@niigata-cc.jp.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Bilim
authors.forename: Kiyotugu
authors.initials: K
authors.lastname: Hoshi
authors.forename: Isoji
authors.initials: I
authors.lastname: Sasagawa
authors.forename: Syun-ichi
authors.initials: S
authors.lastname: Saso
mesh_terms: D000328:Adult; D000368:Aged; D002292:Carcinoma, Renal Cell / Q000150:complications / Q000503:physiopathology*; D006801:Humans; D007680:Kidney Neoplasms / Q000150:complications / Q000503:physiopathology*; D008080:Liposarcoma / Q000150:complications / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000150:complications / Q000503:physiopathology*; D013534:Survival