Abstract

Carcinosarcoma is a type of renal cell carcinoma which exhibits areas of sarcomatous differentiation. It is a rare change seen in renal cell carcinoma and carries very poor prognosis. Carcinosarcoma mostly seen in older age group having an incidence of 1%. Sarcomatoid differentiation in renal cell carcinoma is composed of spindle shaped cells with marked nuclear pleomorphisim. Due to poor survival rate and in the view of high grade of tumour it is very important to diagnose sarcoma component in renal cell carcinoma. Histologically adequate sampling of tissue along with the immunohistochemical studies are required for accurate diagnosis.