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Table 1 AAST organ injury scale – liver injury

From: Liver trauma: WSES position paper

Grade Injury type Injury description
I Haematoma Subcapsular < 10 % surface
  Laceration Capsular tear < 1 cm parenchymal depth
II Haematoma Subcapsular 10–50 % surface area; intraparenchymal, < 10 cm diameter
  Laceration 1–3 cm parenchymal depth, < 10 cm in length
III Haematoma Subcapsular > 50 % surface area or expanding, ruptured subcapsular or parenchymal haematoma. Intraparenchymal haematoma > 10 cm
  Laceration > 3 cm parenchymal depth
IV Laceration Parenchymal disruption 25–75 % of hepatic lobe
V Laceration Parenchymal disruption involving > 75 % of hepatic lobe
  Vascular Juxtavenous hepatic injuries i.e., retrohepatic vena cav/central major hepatic veins
VI Vascular Hepatic avulsion
  1. Advance one grade for multiple injuries up to grade III
  2. AAST liver injury scale (1994 revision)