Fig. 2From: Morphologic change in deep venous thrombosis in the lower extremity after therapeutic anticoagulationEchogenicity of the thrombus: A Anechoic thrombus; The thrombus appears black on the screen. B Hypoechoic thrombus; The thrombus appears grey on the screen. C Hyperechoic thrombus; The thrombus appears white on the screen. a = superficial femoral artery, v = femoral vein.Back to article page