Whether the edge of glioma is clear or not is related to the degree of malignancy of glioma. Among gliomas with relatively clear borders, there are hairy cell astrocytomas, subventricular giant cell astrocytomas, etc., but the edge of the vast majority of gliomas is not clear. Whether the edge of the tumor is clear or not is related to the infiltrative nature of the tumor, usually benign tumors are more clear, and malignant tumors are diffuse with unclear edges. Gliomas are generally classified into four grades. Grade I is generally benign, mainly hairy cell astrocytomas, which account for about 5% of gliomas, and the margins are usually clear. Grade II, III and IV are malignant, and the degree of malignancy increases step by step. Since malignant tumors are mostly diffuse and infiltrative growth, their edges are generally unclear. It is suggested that patients with glioma should go to the hospital, do relevant examination, and then the doctor should make a comprehensive treatment plan according to the specific situation of the patient, and the patient should actively cooperate with the doctor to achieve better treatment effect.