A benign or malignant brain and spinal cord tumor that arises from glial cells (astrocytes, oligodendrocytes, ependymal cells). Tumors that arise from astrocytes are called astrocytic tumors or astrocytomas. Tumors that arise from oligodendrocytes are called oligodendroglial tumors. Tumors that arise from ependymal cells are called ependymomas. The disease is Monarch Disease Ontology term MONDO_0021042 (glioma). Also known as: glial neoplasm, glial tumor, glial tumour, neoplasm of neuroglia, neoplasm of the neuroglia, neuroglial neoplasm, neuroglial tumor, neuroglial tumour.