“…Two board-certified pediatric radiologists (blinded; 5 and 8 years of experience in radiology, respectively) independently reviewed the US images and were blinded to any clinical data and the original US report. The reviewers recorded the following imaging features based on previous research on the postnatal UTD system and pediatric uroradiological terms [6,13] (Table 1): laterality of the involved KU (right, left, bilateral), APRPD, central calyceal dilation, peripheral calyceal dilation, parenchymal appearance abnormalities (altered echogenicity, cortical cysts, decreased corticomedullary differentiation), parenchymal thinning, ureteral dilation, bladder abnormalities (wall thickening, ureterocele, dilated posterior urethra).…”