Fig. 2From: Autologous sapheno-saphenous bypass collateral development in the setting of chronic unilateral iliac vein occlusionDigital subtraction venography demonstrating complete occlusion of the left common iliac vein and collateralization. The site of occlusion is identified (white arrow). Contrast injected ipsilateral and distal to the lesions is seen draining to the contralateral common iliac vein (red arrow) through the dominant left-to-right sapheno-saphenous collateral drainage pathway (black arrow)Back to article page