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Figure 14a.   Atherosclerotic occlusive disease. (a) Dynamic subtraction MR angiogram obtained with three separate injections of gadopentetate dimeglumine shows long segmental occlusions of the right superficial femoral artery (solid arrows) and the left external iliac and superficial femoral arteries (solid arrowheads). Note the reconstitution of the bilateral distal superficial femoral arteries via small collateral arteries. Also note the false-positive occlusions of the right external iliac artery (open arrow) and left popliteal artery (open arrowhead) resulting from inappropriate positioning of the imaging volume. (b) Conventional angiogram also shows reconstitution of the bilateral distal superficial femoral arteries via small collateral arteries. (Reprinted, with permission, from reference 10.)