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In an video published by TMZ on Friday, the 63-year-old actor and wrestler said he has been diagnosed with hydrocephalus, also known as “water on the brain.”

Doctors discovered that she had hydrocephalus, sometimes called “water on the brain,” and implanted a shunt, a device used to drain fluid from the brain.

Hydrocephalus, popularly known as “water on the brain,” is caused by the accumulation of cerebrospinal fluid in cavities known as ventricles.

He worried Jason had hydrocephalus — “water on the brain” — a serious, potentially fatal condition, and had him whisked away for two days of tests.

He had hydrocephalus, "water on the brain."