Basically we can divide renal trauma into five grades.
The grades I , II and III are classified as minor traumas, and the grades IV,V as major :-
- Grade I: contusion or subcapsular hematoma, without parenchymal laceration.
- Grade II: superficial cortical laceration less than 1 cm deep.
- Grade III: deep cortical laceration extending more than 1 cm.
- Grade IV:
- corticomedullary laceration with collecting system injury and urinary extravasation.
- vascular injury:- laceration or thrombosis of a segmental artery.
- Grade V:
- Multiple deep lacerations.
- Thrombosis of the main renal artery.
- Avulsion of renal hilum which devascularizes kidney.
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