Normal pressure hydrocephalus is a common type of hydrocephalus. Some patients are usually largely asymptomatic and are detected incidentally by performing a cranial CT, but most patients with normal pressure hydrocephalus will have symptoms such as significant walking instability, mental decline, and urinary incontinence. Idiopathic normal pressure hydrocephalus and symptomatic normal pressure hydrocephalus In clinical practice, hydrocephalus that appears without any symptoms is called idiopathic normal pressure hydrocephalus and is usually seen in older people over 65 years of age, and in most cases no specific pathogenesis can be found. For hydrocephalus with a clear cause and symptoms is called symptomatic normal pressure hydrocephalus, generally due to hydrocephalus secondary to cerebral hemorrhage surgery, or hydrocephalus secondary to encephalitis, traumatic brain injury, or brain tumor resection, the cause is easy to understand, and people can quickly understand it at a glance. How to diagnose hydrocephalus with normal pressure The diagnosis of hydrocephalus requires a comprehensive assessment from signs, medical history and imaging findings. For patients who have been diagnosed, but have no symptoms, and the pressure inside the skull by lumbar puncture is also within the normal range, after long-term observation, if the hydrocephalus does not expand significantly, treatment is generally not needed, and only regular review is required. For those who develop symptoms, prompt treatment is required. How should normal pressure hydrocephalus be treated? Ventriculoperitoneal shunt is a common technique for treating hydrocephalus, but many people are discouraged by the high probability of shunt blockage and infection that occurs after surgery. In response to the current situation, there is a set of specialized techniques to purify the cerebrospinal fluid and then perform a new ventriculoperitoneal shunt, which can achieve ideal results.