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Table 1 Grading of renal trauma according to the American Association for the Surgery of Trauma (AAST) [14,15,16]

From: Renal trauma: a 5-year retrospective review in single institution

Grade Type of injury Description of injury
I Contusion Microscopic or gross hematuria, urologic studies normal
Hematoma Subcapsular, non-expanding without parenchymal laceration
II Hematoma Non-expanding perirenal hematoma confirmed to renal retroperitoneum
Laceration <1.0 cm parenchymal depth of renal cortex without urinary extravasation
III Laceration >1.0 cm parenchymal depth of renal cortex without collecting system rupture or urinary extravasation
IV Laceration Parenchymal laceration extending through renal cortex, medulla, and collecting system
Vascular Main renal artery or vein injury with contained hemorrhage
V Laceration Completely shattered kidney
Vascular Avulsion of renal hilum which devascularizes the kidney