Renal dynamic computed tomographic (CT) data for 16 patients with unilatera
l renal artery stenosis were compared with those for 12 control subjects. T
hree patterns of perfusion were distinguished in stenotic kidneys: pattern
A, symmetric time-attenuation curves; pattern B, asymmetric time-attenuatio
n curve with similar perfusion; and pattern C, asymmetric time-attenuation
curve with impaired perfusion. Additional functional data can be obtained f
rom the initial timing scan in a CT study of unilateral renal artery stenos
is.