Fig. 5From: Autologous sapheno-saphenous bypass collateral development in the setting of chronic unilateral iliac vein occlusionDigital subtraction venography demonstrates near total occlusion of left iliac vein. Near total occlusion of the left iliac vein (red arrow). Dominant drainage is observed through a left-to-right sapheno-saphenous collaterals (black arrow)Back to article page