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Fig. 7A —Relative signal-versus-time curves for two studies from patient shown in Figures 6A, and 6B. Initial study when infant was 3 months old (A) shows delayed crossover point. By time of second study when infant was 9 months old (B), crossover point has become symmetric, suggesting that intracortical pressure has returned to normal. Distal cortical peak is preserved in both studies, as well as concentration of contrast material in medulla and loop of Henle. Note mild decrease in amplitude of cortex on right, indicating slight impairment in ability of this kidney to extract and concentrate contrast material from vasculature.