Figure 1. Intraoperative ultrasound images. (A-D ) The TT in the IVC; the lowest 2 cm below the level of renal vein confluence, the upper boundary reaches the right atrium, close to the posterior wall of the right atrium, approximately 1 cm long. (E-G ) TT in the right renal vein fills the lumen; TT can be seen in the trunk of the left renal vein and left adrenal vein. The TT in the left adrenal vein was approximately 1 cm long, but no TT was found in the renal vein at the left renal hilum.