The following are the differences between oligodendroglioma and low-grade astrocytoma, embryonic dysplastic neuroepithelioma and gliomatosis: 1. Low-grade astrocytoma: the age of onset is younger than that of oligodendroglioma, and astrocytoma is more likely to occur in the deep part of the brain, while oligodendroglioma is more likely to occur in the superficial part of the brain; astrocytoma is smaller than oligodendroglioma, and the occupying effect is not significant. The foci of astrocytomas are smaller than those of oligodendrogliomas, with no significant peri-tumor edema and no significant enhancement. The incidence of calcification is much higher than that of oligodendroglioma, and the diagnosis of oligodendroglioma should be favored when there are more obvious cerebral gyrus-like or mass-like calcifications. 2.DNET: The age of onset is before 20 years old, it is usually solitary, mainly cystic component, with clear border, some of the lesions can be separated, the tumor is triangular in shape, and there is separation within the lesion, these two manifestations at the same time strongly suggest the diagnosis of DNET, DNET calcification is rare compared with oligodendroglioma, it shows normal spectrum and oligodendroglioma is abnormal, the apparent diffusion coefficient is higher than that of oligodendroglioma. The apparent diffusion coefficient is higher than that of oligodendroglioma. 3, cerebral gliomatosis: the lesion is diffuse infiltrative growth to the longitudinal development of brain tissue swelling is the main, rare cystic necrosis hemorrhage enhancement is mostly non-enhancing.