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Fig. 5C —35-year-old man after placement of popliteal artery-to-anterior tibial artery vein graft for treatment of claudication resulting from popliteal artery stenosis. Follow-up MR angiography (MRA) was performed at 1.5 T using 30 mL of gadolinium contrast agent. Contrast-enhanced axial fat-suppressed T1-weighted image confirms evidence of type III popliteal artery entrapment on left. During dorsiflexion of foot, popliteal artery is compressed by slip of medial head of gastrocnemius muscle (curved arrow) originating more laterally than normal.