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Fig. 2B. —4-year-old boy with vesicoureteral reflux. Images were taken successively, just seconds apart, after administration of contrast medium into bladder. Longitudinal sonogram of bladder and dilated refluxive terminal ureter (arrows) in contrast harmonic (phase inversion) imaging mode with image focus at level of ureter reveals strikingly obvious reflux. Selective, enhanced depiction of microbubbles in ureter is possible in this mode.