Figure 1a. Significant focal stenosis (short straight arrows) at the origin of the right main renal artery in a 59-year-old woman is clearly depicted in the (a) anteroposterior digital subtraction angiogram and (b) full coronal maximum intensity projection image of the high-spatial-resolution small-FOV MR angiogram. (c) Full coronal maximum intensity projection image of the large-FOV MR angiogram shows that the proximal right main renal arterial stenosis appears to be normal at this spatial resolution. Note the blurring in the distal right segmental arteries (curved arrow in b) indicative of renal arterial motion during imaging. There is a 99% stenosis (long straight arrow in b and c) in the left main renal artery, which results in faint but visible enhancement of the left segmental renal arteries in b and c. The left renal arteries were not seen in a. Pulse sequence parameters are as summarized in Table 1.