Hydrocephalus is a brain condition that happens when cerebrospinal fluid (CSF) — the clear, watery fluid that surrounds and cushions the brain and spinal cord — can’t drain from the brain. It then pools, causing a buildup of fluid in the skull.
Hydrocephalus (also called “water on the brain” can make babies’ and young children’s heads swell to make room for the excess fluid.
Older kids, whose skull bones have matured and fused together, have painful headaches from the increased pressure in the head.
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