The sequelae of subarachnoid hemorrhage are usually due to an intracranial aneurysm, which may require a craniotomy to clamp the aneurysm shut so that the patient will not have future symptoms of subarachnoid hemorrhage and will not be at risk for life. The sequelae of craniotomy are usually the sequelae of a ruptured aneurysm, such as hydrocephalus, vasospasm, and chronic headache. In addition, during the process of aneurysm clamping, a small functional major artery or aneurysm-carrying artery may be damaged. After the corresponding artery is lost, there will be functional deficits in the corresponding area, such as hemiplegia of the limbs and changes in visual field, which may be the sequelae of arachnoid opening.