Fig. 3

a CT shows May-Thurner syndrome. b the angiography showed complete occlusion of the left common iliac vein. c-d the middle and upper segments of right iliac vein were filled with a large amount of thrombus. e expanding right iliac vein with 14 mm*4 mm XXL balloon. (f) the stenosis of the right iliac vein and inferior vena cava was relieved