The most common symptoms of glioma: headache, dizziness, some local symptoms, visual disturbance and vomiting, etc. If these symptoms appear, the first thing that comes to mind is to go to the hospital for examination. Early diagnosis of glioma is very important, and early detection and treatment of glioma affects the prognosis. So, what tests are needed for early diagnosis of glioma? Here we will learn more about it. 1.Fundus examination To observe whether there is optic nerve papillary edema b optic nerve papillary edema is a sign of increased intracranial pressure, and it is called the “three evidence” of increased intracranial pressure together with headache and vomiting, but it is only seen in one quarter of patients, so the possibility of glioma cannot be excluded simply by negative eye examination. EEG examination is more important: it has localization value for fast-growing glioma in cerebral hemisphere, which can see the wave amplitude decrease and frequency slowdown on the diseased side. It is an effective screening method before CT examination. 3.MRI can accurately show the location, size and morphology of most intracranial tumors and peritumor edema. It is an important additional examination means of CT, especially for tumors in the skull base and brain stem which are close to the bone, such as benign astrocytoma on the canopy, which can show the abnormalities of the autoplasm and make up for the leakage of CT without abnormal findings, thus, MRI is more suitable for early diagnosis. CT examination of brain: the detection rate of glioma can reach more than 90%, and it is easy to show the size, morphology, number, location, density and nature of lesions, and the anatomical relationship is clear, so it is the main diagnostic method of glioma at present. 4.CT is the most widely used non-invasive brain imaging technology. It can distinguish the subtle differences in X-ray absorption of different tissues in the skull, and make the soft tissue structures in the skull, such as ventricles and brain pools, gray matter and white matter, appear clearly and have high contrast, which is of great value for diagnosing intracranial tumors. 5.PET-CT A large number of studies have shown the value of PET-CT imaging in the diagnosis of glioma, which has become one of the important methods for the diagnosis or follow-up of glioma. PET-CT is better than CT and MRI imaging in the differentiation of benign and malignant glioma, grading and staging of glioma, identification of recurrence and necrosis of glioma, and detection of residual tumor. 6.X-ray is helpful to understand whether there is increased intracranial pressure, local destruction or hyperplasia of skull, enlargement of pterygoid saddle, displacement of pineal calcification and pathological calcification in glioma, etc. It is helpful for localization and qualitative diagnosis, but the positive rate of x-ray is less than one-third, so glioma cannot be excluded because of negative x-ray. Once a glioma is detected, it is important to choose a regular, professional brain hospital and under the guidance of a doctor for symptomatic treatment, do not treat blindly and use drugs blindly to avoid aggravation and serious consequences.