Renal cell carcinoma extending from superior vena cava into right atrium.

Tumoral invasion of inferior vena cava by renal cell carcinoma is reported to be relatively frequent. Usually the tumor grows intraluminally into the renal vein and inferior vena cava as an extension of primary tumor. In this report, we present an unusual case of venous system involvement, invasion of renal cell carcinoma into superior vena cava.