Liver injuries: AAST organ injury scale


Grade I

Hematoma :Subcapsular, nonexpanding, <10% surface area

Laceration: Capsular tear, nonbleeding, <1cm parenchymal depth


Grade II

Hematoma: Subcapsular, nonexpanding, 10-50% surface area - Intraparenchymal, <2cm diameter, nonexpanding

Laceration: Capsular tear, active bleeding, 1-3cm parenchymal depth


Grade III

Hematoma: Subcapsular, >50% surface area or expanding - Ruptured subcapsular hematoma with active bleeding - Intraparenchymal, >2cm diameter or expanding

Laceration : > 3 cm parenchymal depth


Grade IV

Hematoma: Ruptured intraparenchymal hematoma with active bleeding

Laceration: Involving segmental or hilar vessels producing devascularization >25%


Grade V

Laceration: Shattered spleen

Vascular: Hilar vascular injury that devascularizes spleen

! Advance one grade for multiple injuries to same organ up to grade III

See results

Dr Antoine Micheau
CHU Arnaud de Villeneuve
Radiological classifications commonly used in medical imaging
Hepatic trauma liver-injury-AAST-injury-scale