Gliomas are tumors that occur in the neuroectoderm. They are usually divided into gliomas formed by mesenchymal cells and neuronal tumors formed by parenchymal cells. Because the two types of tumors cannot be completely distinguished pathogenetically and morphologically, and because gliomas that originate from mesenchymal cells are much more common than neuronal tumors that originate from parenchymal cells, neuronal tumors are included in gliomas and are collectively referred to as gliomas, and therefore there are more glioma types. There are many different types of gliomas, including astrocytomas, glioblastomas, oligodendrogliomas, and their mesenchymal astrocytomas and mesenchymal oligodendrogliomas. The site of predilection varies among gliomas. For example, astrocytomas are more common in the cerebral hemisphere in adults and in the cerebellum in children; glioblastomas almost always occur in the cerebral hemisphere; and oligodendrogliomas mostly occur in the cerebral hemisphere. It is important to note that the symptoms of glioma vary depending on the location of growth. When abnormalities occur, patients are advised to go to the hospital for professional diagnosis and treatment in a timely manner.