Grade I: Minor contusion or non-expanding subcapsular hematoma without parenchymal laceration.
Grade II: Non-expanding perirenal hematoma confined to the retroperitoneum without parenchymal laceration.
Grade II Parenchymal laceration less than 1 cm deep without urinary extravasation.
Grade III >1cms Laceration Intact Collecting System
Grade IV Vascular Injury or Active Bleeding confined within the Perirenal Fascia
Grade IV Complete Ureteropelvic Disruption
Grade V De-vascularized Kidney
Grade V UPJ Avulsion