The incidence of intracranial tumors varies with age, gender, race, geography and time, and it is generally believed that the annual incidence of primary intracranial tumors is about 10/100,000. Intracranial tumors account for about 1.8% of tumors in various parts of the body; however, brain tumors in children can account for up to 7% of the total, and the incidence and mortality rate (1/4 of childhood deaths) is second only to childhood leukemia, and has jumped to the first place as the cause of death in children in some developed countries. The incidence of central nervous system tumors in Caucasians is higher than that in Yellow and Black. Generally speaking, there is no significant gender difference in the overall incidence of intracranial tumors, or slightly more males than females; certain intracranial tumors have obvious gender advantage, such as meningioma and pituitary adenoma are more common in females, germ cell tumors in the pineal region are more common in male children, and germ cell tumors in the pterionic saddle region are more common in female children. The age distribution of intracranial tumors is the first peak of incidence around 10 years old, and adults are more common between 20 and 50 years old; astrocytoma, ventricular meningioma, medulloblastoma and craniopharyngioma are more common in childhood; ventricular meningioma, pituitary adenoma and craniopharyngioma are more common in youth; astrocytoma, meningioma and Schwann cell tumor are more common in middle-aged people; glioblastoma multiforme and metastases are more common in elderly people. Among intracranial tumors, neuroepithelial tissue tumors (of which astrocytoma takes the first place) are the most common, followed by meningioma, pituitary adenoma, nerve sheath tumor, neurofibroma, congenital tumor, metastatic tumor and vascular tumor. The prevalence of intracranial tumors is related to age. Adult intracranial tumors account for 71% of supratentorial tumors and 29% of infratentorial tumors; in children, tumors in infratentorial and midline areas are more common, among which medulloblastoma accounts for most of the infratentorial tumors and generally occurs in the cerebellar earth, while astrocytoma occurs mostly in the cerebellar hemispheres and brainstem. 8.The age-specific incidence rate of adult tumors continues to increase at the age of 70 years. In recent years, the incidence of intracranial metastases has been increasing. Pathology At present, the pathological classification and pathological diagnosis of intracranial tumors still refer to the fourth edition of WHO neurological tumor classification criteria in 2007, and a new WHO pathological classification and diagnosis criteria may be published in the near future.