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Sarcomatoid renal cell carcinoma with huge retroperitoneal metastasis.

Sarcomatoid Renal Cell Carcinoma (SRC) is a very rare form of renal neoplasm with very poor prognosis. A case of sarcomatoid renal cell carcinoma (SRC) is reported herein at the National Institute of Kidney Diseases and Urology (NIKDU), Dhaka. A 40 year old man presented with swelling in right loin with dragging abdominal pain and intermittent low grade fever. A huge, fleshy and highly vascular retroperitoneal mass was found peroperatively. Tumor affected the lower pole of right kidney invading the renal capsule, perinephric fat and continued to grow as a large tumor mass in the right retroperitoneal space Histologically, it revealed the features of sarcomatoid renal cell carcinoma.