Abstract
The sarcomatoid pattern represents the histological type of renal carcinoma with the poorest prognosis, receiving the grade 4 of the Furhman classification consistently.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.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.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.
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