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AAST Renal Injury Scale

Grade	Description	Image	CT Example
I	Contusion Microscopic or gross hematuria. Urological studies normal. Hematoma Subcapsular, non-expanding without parenchymal laceration.
II	Hematoma Non-expanding peri-renal hematoma confined 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 that devascularises kidney.

A	B	C
D	E	F
G	H	I