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Next, cerebrospinal fluid samples were collected from healthy human participants and spiked with the brain health biomarkers of interest.

Pineal cysts symptoms can be caused if the cyst is big enough to obstruct the passage of cerebrospinal fluid - the fluid constantly produced by the brain, which bathes and supports it, he added.

John Andrews, MD, a resident in neurosurgery, placed the tissue on a nutrient medium that resembles the cerebrospinal fluid that bathes the brain.

A test that looks for genetic hallmarks of brain cancers in samples of cerebrospinal fluid can decrease the time to diagnosis and eliminate the need for invasive brain biopsies for some patients.

And in the brain, they sweep out cerebrospinal fluid to remove waste.