title: Bilateral synchronous renal oncocytoma: a case report and review.
abstract: BACKGROUND
  Renal oncocytoma is a rare benign tumour.
  
  
  METHODS
  A 73-year-old man presented with bilateral renal tumours, suggestive of renal cell carcinoma (RCC). Nephron-sparing surgery (NSS) and radical nephrectomy were performed. Both specimens revealed renal oncocytoma on final histology. A review of nephrectomy specimens showed 4 other solitary oncocytomas out of 250 RCCs over the period 1991 to 2000. Diagnosis of oncocytoma could only be firmly established by careful histological evaluation to exclude RCC.
  
  
  METHODS
  Renal oncocytoma carries a good prognosis. The use of NSS for synchronous bilateral renal masses is highlighted.
  
  
  CONCLUSIONS
  NSS is recommended for renal oncocytoma wherever possible.
authors.affiliation: Department of Urology, Singapore General Hospital, Outram Road, Singapore 169608.
authors.forename: C W
authors.initials: CW
authors.lastname: Peng
authors.forename: S K
authors.initials: SK
authors.lastname: Yip
authors.forename: P H
authors.initials: PH
authors.lastname: Tan
authors.forename: L G
authors.initials: LG
authors.lastname: Ng
mesh_terms: D018249:Adenoma, Oxyphilic / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D011859:Radiography