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Fig. 3B Fetal folds without obstruction in 6-week-old boy who was
evaluated for antenatal hydronephrosis. Time-intensity curves show symmetry of
corticomedullary crossover points and comparable curves for the two kidneys.
Curves are annotated to show their main features: PME = peak medullary
enhancement, DTP = distal tubular peak, MEP = medullary excretory phase, XOP =
crossover point, CEP = cortical excretory phase.