Figure 22. Graft stenosis in a 75-year-old man with diabetes and peripheral vascular disease. He presented with gangrenous changes in the left toes after placement of a bypass graft. Coronal contrast-enhanced MR angiogram obtained with calf injection shows significant stenosis at the origin of a popliteal-to-distal artery bypass graft (arrow). The distal portion of the graft is widely patent.