Glioma, referred to as glioma, is a tumor that occurs in the neuroectoderm. There are two types of tumors occurring in the neuroectoderm: those formed by mesenchymal cells, called gliomas, and those formed by parenchymal cells, called neuronal tumors. Since these two types of tumors cannot be completely distinguished from each other in terms of pathogenesis and morphology, and gliomas originating from mesenchymal cells are much more common than neuronal tumors originating from parenchymal cells, neuronal tumors are included in gliomas and are collectively referred to as gliomas. Basic overview: Glioma is a tumor that occurs in the neuroectoderm, so it is also called neuroectodermal tumor or neuroepithelial tumor. Tumors originate from neurointerstitial cells, i.e., glial, ventricular canal, choroid plexus epithelium, and neuroparenchymal cells, i.e., neurons. Most tumors originate from different types of glia, but based on the similar histogenetic origin and biological characteristics, all kinds of review tumor diseases occurring in the neuroectoderm are generally referred to as gliomas .