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Fig. 7B. —71-year-old woman with pain in left lower calf during exercise. This case is example of overestimation of stenosis using MR angiography. This discrepancy may be caused by projection-related limitations of conventional angiography. Other findings such as mild stenosis in mid third of left superficial femoral artery, severe stenosis of distal superficial femoral artery, and occlusion of popliteal artery on left side were correctly diagnosed on MR angiography. Trifurcation of runoff vessels as normal variant on right side and filling of proximal segments of anterior and peroneal artery after occlusion by collateral vessels on left side are displayed by both three-dimensional MR angiography and conventional angiography. Three-dimensional MR angiographic maximum-intensity-projection images in anteroposterior projection (A) and rotated view (B) show lesion of external iliac artery (arrow) immediately distal to origin of internal iliac artery. Lesion was interpreted as severe.

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