Prenatal ultrasound parameters of the UTD classification. (A) APRPD; (B) calyceal dilation, arrow indicates a dilated calyx;
(C) kidney parenchyma thickness, arrow points at the abnormally thin parenchyma in a fetus with severe UTD at 37 weeks of gestation; (D) the
appearance of the parenchyma, an example of normal echogenicity and corticomedullary differentiation at 34 weeks of gestation; (E) ureter
dilation (arrow) at 34 weeks of gestation; (F) normal bladder and amniotic fluid. APRPD, anterior-posterior renal pelvic diameter; UTD, urinary
tract dilation.
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