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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