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Table 1 AAST Liver Trauma Classification

From: WSES classification and guidelines for liver trauma

Grade

Injury type

Injury description

I

Haematoma

Subcapsular <10 % surface

Laceration

Capsular tear <1 cm parenchymal depth

II

Haematoma

Subcapsular 10–50 % surface area; intraprenchymal, <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. Intraprenchymal haematoma >10 cm

Laceration

>3 cm parenchymal depth

IV

Laceration

Parenchymal disruption 25–75 % of hepatic lobe

Vascular

Juxtavenous hepatic injuries i.e. retrohepatic vena cava/centrl 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)