title: Renal cell carcinoma with a tumor thrombus in the ureter: a case report.
abstract: BACKGROUND
  Renal cell carcinoma (RCCs) is the most common malignancy of the kidney. When RCC progresses, it is known to form tumor thrombus in the renal vein and/or inferior vena cava. However, RCC does not normally form tumor thrombus in the ureter or renal pelvis.
  
  
  METHODS
  A 43-year-old man presented to our department for the treatment of a renal tumor with asymptomatic gross hematuria. In a dynamic CT study, contrast enhancement revealed a tumor suspected to be RCC, but atypical finding as a tumor thrombus that filled the renal pelvis and the whole ureter was also observed. Nephroureterectomy was performed, and the tumor was diagnosed histopathologically as RCC.
  
  
  CONCLUSIONS
  We report here a very rare case of RCC with a tumor thrombus in the whole ureter.
authors.affiliation: Department of Urology, Kagawa Prefectural Central Hospital, 5-4-16, Ban-cho, Takamatsu, Kagawa, 760-8557, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Fujita
authors.forename: Koichiro
authors.initials: K
authors.lastname: Wada
authors.forename: Tomoya
authors.initials: T
authors.lastname: Yamasaki
authors.forename: Daisuke
authors.initials: D
authors.lastname: Manabe
authors.forename: Katsuji
authors.initials: K
authors.lastname: Takeda
authors.forename: Satoko
authors.initials: S
authors.lastname: Nakamura
mesh_terms: D000328:Adult; D002292:Carcinoma, Renal Cell / Q000150:complications* / Q000556:secondary; D006801:Humans; D007680:Kidney Neoplasms / Q000150:complications* / Q000473:pathology; D008297:Male; D013927:Thrombosis / Q000000981:diagnostic imaging / Q000209:etiology*; D014057:Tomography, X-Ray Computed; D014515:Ureteral Diseases / Q000000981:diagnostic imaging / Q000209:etiology*