Patients with brain tumor often have characteristic clinical manifestations in the late stage of the disease, and most of the patients in the late stage of the disease will have serious intracranial pressure increase when the volume of brain tumor increases to a certain degree, resulting in extensive brain tissue edema, and patients will have obvious headache, dizziness, nausea, vomiting, as well as optic papilla edema, visual acuity loss, and visual field defects. Due to the severe intracranial pressure increase, it often causes obvious space-occupying effect, which forms compression or invasion to the surrounding brain tissues leading to cranial nerve dysfunction. Patients may suffer from hemiparesis, aphasia, numbness of limbs, sensory abnormalities and even seizures. In the advanced stage of the disease, excessive intracranial pressure often induces cerebral herniation, leading to obvious consciousness disorders in patients.