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Table 1 American Association for the Surgery of Trauma (AAST) -scale and modified scale for classification of liver injuries

From: Transplantation after blunt trauma to the liver: a valuable option or just a "waste of organs"?

AAST Grade Injury Injury Description AIS-98* Grade
I hematoma subcapsular, < 10% surface 2
  laceration capsular tear, < 1 cm parenchymal depth 2
II hematoma subcapsular, 10-50% surface; intraparenchymal hematoma, < 10 cm in diameter 2
  laceration capsular tear, 1-3 cm parenchymal depth, < 10 cm length 2
III hematoma subcapsular, > 50% surface; intraparenchymal hematoma, > 10 cm in diameter 3
  laceration > 3 cm parenchymal depth 3
IV laceration parenchymal disruption involving 25-75% of hepatic lobe or 1-3 segments 4
V laceration parenchymal disruption involving > 75% of hepatic lobe or > 3 segments within a single lobe 5
  vascular hepatic venous injuries 5
VI vascular hepatic avulsion 6
  1. *Note-AIS-98 = Abbreviated Injury Scale, 1998 version.