Table 2. Liver injury classification by the American Association for the Surgery of Trauma.

Adapted from [12].

Grade	Type of Injury	Description of Injury
I	Hematoma Laceration	Subcapsular, <10% surface area Capsular tear, <1cm parenchymal depth
II	Hematoma Laceration	Subcapsular, 10%-50% surface area Intraparenchymal <10 cm diameter Capsular tear 1-3 cm parenchymal depth, <10 cm length
III	Hematoma Laceration	Subcapsular, >50% surface area of ruptured subcapsular or parenchymal hematoma Intraparenchymal >10 cm Capsular tear >3 cm parenchymal depth
IV	Laceration	Parenchymal disruption involving 25%-75% hepatic lobe or involves 1-3 Couinaud segments
V	Laceration Vascular	Parenchymal disruption involving >75% of hepatic lobe Juxtahepatic venous injuries (retrohepatic vena cava / central major hepatic veins)
VI	Vascular	Hepatic Avulsion