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Cerebro-spinal fluid is the clear fluid that surrounds the brain and spinal cord. It's primary function is to act as a shock absorber for the brain and spinal cord, but it also plays a role in preventing infection from entering the brain case or the spine. In a normal person, the CSF is created and drained between 3 and 4 times a day.
Because CSF is being continuously created, if it does not drain properly, it can quickly increase pressure in the skull and prevent the correct flow of blood to the brain.