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Fig. 4B —61-year-old man with rest pain in both feet that is worse in right foot. Digital subtraction angiography shows patent right common femoral artery to above-knee popliteal artery bypass graft. Note that focal areas of decreased lumen diameter on MR angiogram correspond to levels of metallic surgical clips (arrows) located around graft and at distal anastomosis site. Metallic susceptibility artifact can be recognized by characteristic signal buildup at edge of signal void area due to intravoxel phase distortions.