A tumor composed of two or more glial cell types (astrocytes, ependymal cells, and oligodendrocytes). The disease is mixed glioma (MONDO_0003268). Also known as: glioma, mixed, glioma, mixed, malignant, mixed glial neoplasm, mixed glial tumor, mixed glial tumour, mixed glioma (morphologic abnormality), mixed gliomas, mixed neuroglial neoplasm.