Brain hemorrhage forming brain herniation can be revived if resuscitation is timely. In general, there is an approximate statistic that if the pupils are dilated and the bone flap is removed and the intracranial hematoma is cleared within one hour after craniotomy to reduce the intracranial pressure and prevent the formation of brain herniation, it is very possible to wake up after surgery. However, if the brain herniation is prolonged, for example, more than 3-4 hours, the pupils are bilaterally dilated and the spontaneous breathing has disappeared, the possibility of waking up after surgery is basically zero if these high-risk factors exist. There are many possibilities that can produce a vegetative state or even death.