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Table 1 American Association for the Surgery of Trauma (AAST) classification of renal trauma

From: MDCT of blunt renal trauma: imaging findings and therapeutic implications

Grade Type Description
I Parenchyma
Haematoma
Microscopic or gross haematuria with normal urologic studies (contusion)
Non-expanding subcapsular haematoma
II Parenchyma
Haematoma
Laceration <1 cm in depth, without collecting system rupture
Non-expanding perirenal haematoma confined to retroperitoneum
III Parenchyma Laceration >1 cm in depth without collecting system rupture
IV Parenchyma
Vascular
Laceration with collecting system rupture
Main renal artery/vein injury with contained haemorrhage
V Parenchyma
Vascular
Shattered kidney
Avulsion of renal hilum that devascularises kidney