* Not a rare disease
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Although the exact cause of pineal cysts is unknown, several theories have been proposed based on autopsy findings. One theory is that pineal cysts arise from the pineal recess in a part of the brain called the third ventricle. Others have proposed that they form because of reduced blood flow or the growth of glial plaques (deposits that buildup). According to another theory, pineal cysts form as a cluster of degenerated cells called pinealocytes.
Last updated: 4/8/2010