Background: Brain tumors account for about 85-90% of all cancers of the central nervous system. The incidence of brain tumors is 10-17 per 100.000 per person for intracranial tumors and 1-2 per 100.000 per person for intraspinal tumors. Brain tumors have slightly different characteristics from tumors that grow elsewhere. There is no premalignant or in situ stage. For example, benign glial tumor…