A buildup of cerebrospinal fluid in the ventricles of the brain caused by a defect of circulation of CSF. The circulation may be blocked or there may be a defect of absorption. Very rarely, there may be excess production of CSF. The excess fluid increases the size of the ventricles and puts pressure on the brain. Increased intracranial pressure can damage brain tissues and result in neurological impairment.

While the most common causes of hydrocephalus differ according to age, symptomatic hydrocephalus occurs more frequently among infants and adults 60 and over. Surgical treatments can allay abnormal accumulations of CSF.

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