Hydronephrosis size: understanding the ultrasound report

Enter the renal pelvis size and other findings from the ultrasound report. The result gives initial information based on the international UTD classification and does not replace a diagnosis.

Sources

Nguyen HT, Benson CB, Bromley B, et al. Multidisciplinary consensus on the classification of prenatal and postnatal urinary tract dilation (UTD classification system). J Pediatr Urol. 2014;10(6):982–998.
EAU Guidelines on Paediatric Urology, 2025: Hydronephrosis and pelvi-ureteric junction obstruction.