脑积水是由于神经系统先天发育异常所引起,大量脑积液(500～3000mL)积聚在颅腔内,致颅腔体积增大,颅缝明显变宽,囟门显著增大(如中脑水管的闭锁、狭窄或膈膜形成,第四脑室正中孔和侧孔发育不良引起脑脊液循环阻滞,都可使过多的脑脊液聚集于脑室或脑池内。使脑内压增大,脑室扩张 Hydrocephalus is due to congenital abnormalities in the nervous system caused by the accumulation of a large number of brain fluid (500 ~ 3000mL) accumulated in the cranial cavity, resulting in increased cranial volume, cranial suture was significantly wider fontanelle significantly increased (such as the central lumen atresia , Stenosis or diaphragm formation, the fourth ventricle hole and lateral hole dysplasia caused by cerebrospinal fluid circulation block, can make too much cerebrospinal fluid gathered in the ventricle or brain pool. Increased intracranial pressure, ventricular dilatation