Grade

Definition

1

SAH < 5 mm

2

SAH > 5 mm

3A

SAH < 5 mm, DML < 5 mm, IME

3B

SAH < 5 mm, DML > 5 mm, IME

4A

SAH > 5 mm, DML < 5 mm, IME

4B

SAH > 5 mm, DML > 5 mm, IME

SAH: Subarachnoid hemorrhage; DML: deviation from the midline; IME: Injury with mass effect.