Figure 21c. Lower-extremity aneurysms in a 60-year-old man with deep vein thrombosis. (a, b) Coronal MIP images from contrast-enhanced MR angiography of the aortoiliac (a) and thigh (b) stations show aneurysms of both common iliac arteries (arrows in a), the left common femoral artery, and both popliteal arteries (arrows in b). (c) Coronal contrast-enhanced MR angiogram of the thigh shows disappearance of the aneurysms after treatment with bilateral bypass grafts. Note the clip artifacts in the grafts (arrows).