Figure 3. Comparison of the left lower-limb DVT before and after surgery. (A) Venography before intervention revealed extensive thrombosis in the left lower-limb deep vein. The contrast agent was unable to pass through, and many collateral veins were visualized. The green arrow shows the collateral veins. (B) Venography after intervention revealed the contrast agent passed smoothly through the left lower-limb deep vein, and the venous lumen was relatively wider. The red arrow shows the recanalized deep vein. (C) IVC venography after thrombolysis and aspiration treatment of DVT revealed some thrombus under the filter. The blood flow from the left iliac vein returned only to the left IVC, and no communicating branches were found between left and right IVCs. The yellow arrow shows the IVC filter and the blue arrow shows the thrombus under the filter.