AAST liver injury scale | Radiology Reference Article | Radiopaedia.org
Radiopaedia.org
Classification
grade I
hematoma: subcapsular, <10% surface arealaceration: capsular tear, <1 cm parenchymal depth
grade II
hematoma: subcapsular, 10-50% surface areahematoma: intraparenchymal <10 cm diameterlaceration: capsular tear 1-3 cm parenchymal depth, <10 cm
length
grade III
hematoma: subcapsular, >50% surface area of ruptured subcapsular or parenchymal hematomahematoma: intraparenchymal >10 cmlaceration:
capsular tear >3 cm parenchymal depthvascular injury with active bleeding contained within liver parenchyma
grade IV
laceration: parenchymal disruption involving 25-75% hepatic lobe or involves 1-3 Couinaud segments vascular injury with active bleeding breaching the
liver parenchyma into the peritoneum
grade V
laceration: parenchymal disruption involving >75% of hepatic lobevascular: juxtahepatic venous injuries (retrohepatic vena cava / central major hepatic
veins)
Radiopaedia.org
Classification
grade I
hematoma: subcapsular, <10% surface arealaceration: capsular tear, <1 cm parenchymal depth
grade II
hematoma: subcapsular, 10-50% surface areahematoma: intraparenchymal <10 cm diameterlaceration: capsular tear 1-3 cm parenchymal depth, <10 cm
length
grade III
hematoma: subcapsular, >50% surface area of ruptured subcapsular or parenchymal hematomahematoma: intraparenchymal >10 cmlaceration:
capsular tear >3 cm parenchymal depthvascular injury with active bleeding contained within liver parenchyma
grade IV
laceration: parenchymal disruption involving 25-75% hepatic lobe or involves 1-3 Couinaud segments vascular injury with active bleeding breaching the
liver parenchyma into the peritoneum
grade V
laceration: parenchymal disruption involving >75% of hepatic lobevascular: juxtahepatic venous injuries (retrohepatic vena cava / central major hepatic
veins)
