Fig. 2

The procedure of the modified operation method: a The right renal artery, the right renal vein and the distal end of IVC were twined by double circles of vascular blocking tape; A small incision of 0.5 cm was made with the scalpel. The balloon catheter was placed into the small incision and extended to the proximal end of tumor thrombus. b Pull the balloon catheter and remove the tumor thrombus completely from the IVC. The incision of IVC was clipped with Satinsky clamp, and the IVC was partially blocked. c The right renal artery and right renal vein were unblocked. The incision of IVC was sutured continuously with non-absorbable vascular suture