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. 2013 Oct 14;13:47. doi: 10.1186/1471-2490-13-47

Figure 1.

Figure 1

Classification of tumor thrombus level according to the Mayo staging system. Level 0, thrombus extending to the renal vein; level I, thrombus extending into the IVC to no more than 2 cm above the renal vein; level II, thrombus extending into the IVC to more than 2 cm above the renal vein but not to the hepatic vein; level III, thrombus extending into the IVC to above the hepatic vein but not to the diaphragm; and level IV, thrombus extending into the supradiaphragmatic IVC or right atrium.