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©2013 UpToDate ® Print Email American Association for the Surgery of Trauma organ injury severity scale for the kidney Grade Type Description I Contusion Microscopic or gross hematuria, urologic studies normal Hematoma Subcapsular, nonexpanding hematoma without parenchymal laceration II Hematoma Nonexpanding perirenal hematoma confined to renal retroperitoneum Laceration Laceration <1 cm depth of renal cortex without urinary extravasation III Laceration Laceration >1 cm 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, devascularizing the kidney Reproduced with permission from: Santucci RA, McAninch JW, Safir M, et al. Validation of the American Association for the Surgery of Trauma organ injury severity scale for the kidney. J Trauma 2001; 50:195. Copyright © 2001 Lippincott Williams & Wilkins.