Most oligodendrogliomas are slow-growing and have a long course, with an average of 2-3 years from the onset of symptoms to the time of consultation. The clinical symptoms of oligodendroglioma are atypical and vary depending on the location of the tumor, making it difficult to distinguish it from other types of gliomas. Among them, epilepsy is the most common symptom of this disease. The incidence of epilepsy is about 35%-85%, and it is the first among neuroepithelial tumors and most patients present with the first symptoms. In addition, hemiparesis and hemianesthesia are also common symptoms of this disease. The incidence is about 30%. If the tumor is located in the frontal lobe, especially when the tumor infiltrates into the contralateral frontal lobe along the corpus callosum, the symptoms are more obvious, mainly manifesting as emotional abnormalities and dementia. The symptoms of high cranial pressure usually appear later, but the incidence is higher, about 50%.