Figure 2a. (a, b) Anteroposterior x-ray angiograms obtained in a 73-year-old man reveal a severe stenosis (short arrow in a) in the proximal left main renal artery in (a) the unsubtracted view and a distal stenosis (curved arrow in b) in the right main renal artery in (b) the digitally subtracted view. Also, segmental stenoses (long straight arrow in a and b) are seen bilaterally. (c) Coronal maximum intensity projection image of the high-spatial-resolution small-FOV MR angiogram shows excellent correspondence to the digital subtraction angiograms for the left main renal arterial stenosis (middle straight arrow) and distal right main stenosis (curved arrow). Bilateral segmental disease (outermost straight arrows) is also well depicted. (d) Magnified coronal subvolume of the large-FOV MR angiogram depicts the proximal left main renal arterial stenosis (middle straight arrow) well, but depiction of the segmental stenoses (outermost straight arrows) and distal right main renal arterial stenosis (curved arrow) is limited by inadequate spatial resolution and interference from parenchymal enhancement. Pulse sequence parameters are as summarized in Table 1.