FIGURE 5.  Stenosis related to FMD in 35-y-old man. (A) ACE inhibitor renography shows 1-min images of radiotracer uptake (^99mTc-MAG3). Right kidney is performing 95% of the renal function, which was decreased (tubular extraction rate, 160 mL/min/1.73 m²). (B) Time–activity curves of left (blue) and right (red) kidneys show almost no participation of the left kidney to renal function. (C) Angiogram shows irregular stenosis (arrow) and beading (arrowheads). (D) Color Duplex sonography of peripheral artery of left kidney demonstrates parvus–tardus pattern with collapsed resistance index (0.35). (E) In contrast, right kidney shows normal Doppler spectrum.