A New Grading System for the Management of Antenatal Hydronephrosis.

Background And Objectives: Standard clinical assessments do not predict surgical intervention in patients with a moderate degree of upper tract hydronephrosis. This study investigated whether combined measures of renal calyceal dilation and anteroposterior diameter (APD) of the renal pelvis at the first postnatal ultrasound better predict surgical intervention beyond standard assessments of the APD or Society of Fetal Urology (SFU) grading system.

Design, Setting, Participants, & Measurements: A retrospective cohort of 348 children with antenatal hydronephrosis followed from 2003 to 2013 were studied.