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Renal sonogram (right kidney longitudinal view) of infant at 4 months of age born following PGD for ARPKD. Kidney measures 5.3 cm in length (normal for patient age is 5.28 cm ± 1.32 cm). Note striking corticomedullary differentiation and normal echogenicity when compared to the liver, which are characteristic of normal renal ultrasound for this age. (a) liver, (b) medullary pyramid, and (c) renal cortex
