title: [Synchronous bilateral renal oncocytoma].
abstract: OBJECTIVE
  The present study reports a case of bilateral synchronous renal oncocytoma and reviews similar cases described in the literature.
  
  
  METHODS
  The present case was incidentally discovered in an 81-year-old female during evaluation for GI disease. The arteriogram was suggestive of oncocytoma and was confirmed by aspiration biopsy. The patient refused surgery. At 42 months' follow-up, the size and degree of invasion of both tumors remain unchanged. To our knowledge, only 20 cases of bilateral synchronous oncocytoma have been reported in the literature and only 6 of these were multifocal lesions.
  
  
  RESULTS
  Renal oncocytoma, like salivary gland lesions, may spread as an advanced stage multifocal nodular oncocytic hyperplasia. Therefore it is not surprising to detect multiple synchronous or metachronous oncocytomas.
  
  
  CONCLUSIONS
  Bilateral renal masses are a diagnostic and therapeutic difficulty, and even more so in the absence of systemic manifestations, hereditary disorders or a family history of renal tumor.
authors.affiliation: Servicio de Urología, Hospital Príncipe de Asturias, Alcalá de Henares, Madrid, España.
authors.forename: M
authors.initials: M
authors.lastname: Sánchez-Chapado
authors.forename: J
authors.initials: J
authors.lastname: Angulo Cuesta
authors.forename: F
authors.initials: F
authors.lastname: Rodríguez de Bethencourt Codes
authors.forename: J
authors.initials: J
authors.lastname: Ontoria
authors.forename: L
authors.initials: L
authors.lastname: Prieto Chaparro
authors.forename: A
authors.initials: A
authors.lastname: Dehaini
mesh_terms: D018249:Adenoma, Oxyphilic / Q000000981:diagnostic imaging / Q000473:pathology*; D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging / Q000473:pathology; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D009378:Neoplasms, Multiple Primary / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed
vernacular_title: Oncocitoma renal bilateral sincrónico.