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Fig. 5A. —69-year-old man treated 8 years before for peripheral vascular disease by placement of expanded polytetrafluoroethylene femoropopiteal bypass graft. Three-dimensional MR angiogram shows artifacts from nitinol ligating clips in proximity of graft mimicking stenoses in two locations (arrowheads). Note also occluded popliteal artery just distal to distal anastomosis (arrows), resulting in flow across distal anastomosis, with retrograde flow in popliteal artery below knee.