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

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