Tumors of the Central Nervous System (II)

Approximately 34,000 intracranial neoplasms occurred in the United States during the years 1973–1974. The numbers of primary and metastatic intracranial tumors among these patients were about equal. Gliomas account for about one-half of primary neoplasms, regardless of the patient’s age. The prevalence of glioblastoma, schwannoma, and meningioma markedly increase with advancing age. Women have a greater susceptibility than men to develop meningiomas and pituitary adenomas; after the age of 40, gliomas and schwannomas are more frequent among men than women.237