Hydrocephalus after meningioma surgery, whether it is serious or not depends on the degree of hydrocephalus, if mild hydrocephalus, relatively less serious, if the hydrocephalus is obvious, relatively more serious. After meningioma surgery, the patient reviews the head CT and finds that the ventricles are dilated and the surrounding interstitial edema, hydrocephalus can be considered. If the ventricles are only slightly dilated, then the patient often has no obvious clinical manifestations, or only a slight headache and dizziness and other manifestations, through the mannitol dehydration to reduce intracranial pressure treatment, the patient’s situation is generally a better prognosis, relatively less serious. If the ventricular dilatation is obvious, and the surrounding interstitial edema is also obvious, which indicates that the degree of hydrocephalus is very serious, the patient can appear limb weakness, memory loss, and even personality disorders and other manifestations, and often need to undergo surgical treatment, and the hydrocephalus in this case is relatively more serious. Hydrocephalus after meningioma surgery, no matter whether it is serious or not, it is recommended that patients go to the hospital in time to avoid delayed treatment.