Zemp L, et al. - Authors carried out this study to assess the radiographic predictors of intervention for blunt renal trauma independent of the American Association of the Surgery for Trauma Organ Injury Scale (AAST-OIS). The AAST-OIS was strongly associated with the need for urologic intervention. However, perinephric hematoma size was also found to have an independent association with this occurrence. They recommended considering perinephric hematoma diameter during clinical decision-making and incorporating it into a revised injury grading system.