Brain tumor, also known as intracranial tumor, is a kind of brain disease that starts slowly and gets worse gradually. Those with primary origin in the skull are called primary intracranial tumors; those metastasized from malignant tumors in other parts of the body to the skull are called metastatic intracranial tumors. The common intracranial tumors include glioma, meningioma and nerve sheath tumor. Brain tumors account for about 2% of all tumors in the body, and about 7% in children. Typical brain tumor symptoms are: headache, vomiting, and vision loss. The medical term for this group of symptoms is “intracranial hypertension syndrome”. When a patient has typical intracranial hypertension syndrome, if CT or MRI examination is performed, more than 90% of the patients can be found to have tumor or other occupying lesions in the skull. Secondly, different clinical manifestations of brain tumor will occur in different parts of the brain. For example, if the tumor grows in the motor or sensory center, the patient will experience paralysis or sensory disorder of one side of the limb. Some brain tumors may also affect endocrine function. However, due to the structural characteristics of the brain, nearly 10% of patients have a certain size of tumor growing in the brain without obvious symptoms.