Fig. 1From: Morphologic change in deep venous thrombosis in the lower extremity after therapeutic anticoagulationSize of the affected vein: A Increased size; The thrombus in the femoral vein (FV) is larger than that in the adjacent superficial femoral artery (SFA). B Normal vein size. The thrombus in the FV is equal to the adjacent SFA. C Decreased vein size; The thrombus in the FV is smaller than the adjacent SFA. a = superficial femoral artery, v = femoral vein.Back to article page