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Renal trauma grading

Dr MT Niknejad and Dr Frank Gaillard et al.

Renal trauma grading is often done using the American Association for the Surgery of Trauma (AAST) 3-4 according to depth of damage and involvement of the urinary collecting system and renal vessels. 

  • grade I - contusion or non enlarging subcapsular haematoma, but no laceration ;
  • grade II - superfical laceration < 1cm depth and does not involve the collecting system ; non expanding perirenal haematoma
  • grade III - laceration > 1cm, without extension into the renal pelvis or collecting system and with no evidence of urine extravasation
  • grade IV - laceration extends to renal pelvis or urinary extravasation.
  • grade V - shattered kidney ; devascularisation of kidney due to hilar injury.

See also

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