Abstract. Brain tumors make up to 20% of malignant tumor diseases in children. These tumors differ from each other in their structure and characteristics. In children, medullablastomas (tumors that develop independently), as well as astrocytomas (malignant tumors of the central nervous system), glioblastomas that arise in the spinal cord, and ependymoma tumors that develop in the internal spaces of the brain are found in children.