Renal trauma gradingDr Matt Skalski 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, and no lacerationgrade II: superficial laceration <1 cm depth and does not involve the collecting system (no evidence of urine extravasation), non expanding perirenal haematomagrade III: laceration >1 cm without extension into the renal pelvis or collecting system (no evidence of urine extravasation) grade IVlaceration extends to renal pelvis or urinary extra-vasationvascular: injury to main renal artery or vein with contained haemorrhagesegmental infarctions without associated lacerationsexpanding subcapsular hematomas compressing the kidneygrade Vshattered kidneyavulsion of renal hilum: devascularisation of kidney due to hilar injuryureteropelvic avulsionscomplete laceration or thrombus of the main renal artery or veinSee also
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