Not all frontal subdural effusions require management; if the patient has no obvious clinical signs or the thickness of the effusion is less than 1 cm, clinical observation is often all that is needed. When the amount of effusion exceeds a certain level, the patient develops clinical symptoms or the thickness is greater than 1cm, surgical intervention is required. There are two main methods of intervention: 1, local drainage, that is, after minimally invasive drilling to drain the effusion to the outside, thus playing a therapeutic effect; 2, due to the recurrence of effusion, drainage can not achieve a good therapeutic effect, the patient can be subdural effusion to the abdominal cavity of the internal drainage surgery. These two treatments need to be decided according to the patient’s specific situation. Some patients with subdural effusion will gradually progress to subdural hemorrhage, which requires surgical treatment at this time. Frontal subdural effusion is a clinical disease caused by excessive localized accumulation of cerebrospinal fluid in the frontal subarachnoid space. Clinical manifestations are mainly due to the compression of the brain by the effusion, and patients may have headache, nausea, limb weakness, numbness and other clinical manifestations. Elderly patients may have slow reaction, decline, in the clinic there are also family members think that the patient has dementia symptoms to consult the doctor, but after examination found that it is because of the frontal subdural effusion.