title: Bilateral synchronous occurrence of three different histological types of renal tumor: a case report.
abstract: BACKGROUND
  Renal cell carcinomas account for 85% of all renal neoplasms. With the introduction of modern imaging modalities, there has been an increased diagnosis of renal tumors. Recent studies have shown that partial nephrectomy can be as safe as radical nephrectomy for smaller renal tumors. Renal cell carcinomas are usually unilateral, however, they can be bilateral in 2% to 4% of sporadic cases and considerably more common in familial cases.
  
  
  METHODS
  In this case report, we describe an unusual case of two bilateral synchronous chromophobe renal cell carcinomas accompanied by an oncocytoma and an angiomyolipoma, that were all treated by open partial nephrectomy.
  
  
  CONCLUSIONS
  To the best of our knowledge, this is the first case report on the synchronous occurrence of bilateral chromophobe renal cell carcinomas associated with an oncocytoma and an angiomyolipoma.
authors.affiliation: 1st Department of Urology, Aristotle University of Thessaloniki Ethnikis Amynis 41, 54635 Thessaloniki Greece.
authors.forename: Demetrios
authors.initials: D
authors.lastname: Radopoulos
authors.forename: Anastasios
authors.initials: A
authors.lastname: Tahmatzopoulos
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Kalinderis
authors.forename: Georgios
authors.initials: G
authors.lastname: Dimitriadis