Fig. 3From: Morphologic change in deep venous thrombosis in the lower extremity after therapeutic anticoagulationShape of the thrombus: A Concentric thrombus; the thrombus causes total occlusion of the popliteal vein. B Eccentric thrombus: the thrombus causes partial occlusion and forms an obtuse angle with the venous wall. a = popliteal artery, v = popliteal vein.Back to article page