Transthoracic echo: A sensitive tool for detecting cardiac extension of renal cell carcinoma?

Table 1 Classification of renal cell carcinoma tumor thrombus

Tumor thrombus level[6]	Characteristics[6]
Level I	Extension to 2 cm above the renal vein into the IVC
Level II	Extension to the subhepatic level, > 2 cm above the renal vein BUT below the diaphragm
Level III	Extension into the intrahepatic IVC BUT below the diaphragm
Level IV	Extension into the right atrium of the heart

IVC: Inferior vena cava.