title: [Sarcomatoid renal carcinoma with malignant heterologous elements: case report].
abstract: OBJECTIVE
  The sarcomatoid pattern represents the histological type of renal carcinoma with the poorest prognosis, receiving the grade 4 of the Furhman classification consistently.
  
  
  METHODS
  We report the case of a 80-year-old male who underwent nephroureterectomy with the pathologic diagnosis of sarcomatoid renal carcinoma with areas of chondro and osteosarcoma, as well as squamous cell differentiation. It is an exceptional case because it is rare to find all these elements in the same tumor.
  
  
  RESULTS
  The study of the surgical specimen enables in most cases the identification of some of the classic histological patterns of renal carcinoma, nevertheless an immunohistochemical study is of great value for proper classification of the neoplasia and differential diagnosis with other renal lesions, mainly sarcomas.
  
  
  CONCLUSIONS
  The presence of malignant heterologous elements, as in our case, will confirm the prognosis of these neoplasias, which really don't have an effective treatment.
authors.affiliation: Servicios de Anatomía Patológica del Hospital de Jerez de la Frontera, Cádiz y del Hospital Universitario Virgen Macarena, Sevilla, España. javiertorresgomez@yahoo.es
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Torres Gómez
authors.forename: Francisco Javier
authors.initials: FJ
authors.lastname: Torres Olivera
mesh_terms: D000369:Aged, 80 and over; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology* / Q000601:surgery; D008297:Male; D012509:Sarcoma / Q000473:pathology* / Q000601:surgery