Clinical Research Directory

Inclusion Criteria: * Pediatric patients referred to one of the participating centers between January 1 2000 and August 31 2021 for either a prenatal or a postnatal diagnosis of urinary tract dilatation; * Urinary tract dilatation documented on at least one postnatal ultrasound, with related measurements; * Presence of at least one other ultrasound performed during follow-up in the postnatal period. Exclusion Criteria: * Lack of some of the clinical data considered crucial to the study, particularly incomplete ultrasound reports referable to at least two different ultrasounds performed in follow-up; * Dilatation with a picture of documented renal lithiasis.