Hydrocephalus is the pathological result of a disruption of the physiological balance of cerebrospinal fluid in the cranial cavity due to various causes. The manifestations are: excessive secretion or (and) impaired circulation and absorption of cerebrospinal fluid. The result: increased volume of intracranial cerebrospinal fluid and enlargement of the ventricular system or (and) enlargement of the subarachnoid space. Typical symptoms are usually headache, vomiting, blurred vision, optic nerve papilla edema, occasionally diplopia, vertigo and seizures. The main manifestations of hydrocephalus in infancy and early childhood onset are abnormal enlargement of the skull, sunset signs, and impaired intellectual development. For example, the normal development of the child suddenly stops at a certain stage and even appears to be inverted. In untreated congenital hydrocephalus, about half of the children die within a year and a half, although 20% of them stop developing. There is another type of hydrocephalus with a higher incidence in adults, named normal pressure hydrocephalus, which manifests as progressive dementia, uncontrollable diencephaly, and difficulty walking. The former is mostly obstructive hydrocephalus and the latter is mostly traffic hydrocephalus. General cranial MRI can reveal ventricular dilatation, periventricular interstitial edema, and even the cause and location of the obstruction.