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Fig. 5B —7-week-old girl with left ureteropelvic junction (UPJ) obstruction. Time-intensity curve shows delay in corticomedullary crossover point, suggesting increased tubular pressure. Note also decreased amplitude of medullary peak and loss of distal tubular peak in cortex, indicating impaired concentrating ability in both cortex and medulla. These findings may indicate that surgery to relieve increased tubular pressure might prevent further functional deterioration in this kidney.