Acute extradural hematoma,the most common secondary change after craniocerebral injury,can induce cerebral herniation to threaten life rapidly for its prompt evolution.

• 急性硬膜外血肿是颅脑损伤后最常见的颅内继发性病变,病情发展迅速,可在损伤后短期发生脑疝,危及生命。