Fig. 1

Ultrasonography showing the regression of deep venous thrombosis. a Ultrasonography (iU-22, Philips) images of the left lower extremity showing extensive deep vein thrombosis at the initial examination (1 month after the first appearance of symptoms); Additional file 1. b Ultrasonography (Noblus, Hitachi Aloka Medical) images of the left lower extremity after 3 months of treatment; Additional file 2. Although some thrombi are still visible in the popliteal vein, no remaining thrombi were observed in the left superficial femoral and soleus muscle veins. c Ultrasonography (Aplio XG, Toshiba) images of the left lower extremity after 6 months of treatment; Additional file 3. No remaining thrombi were observed and only mural thrombi remained in the popliteal vein