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Top: Health: Conditions_and_Diseases: Cancer: Brain_and_CNS: Brain_Tumor,_Adult: Pineal_Astrocytic_Tumor

The pineal gland is a tiny organ in the brain that produces the hormone melatonin, a substance that helps control our sleeping and waking cycle. Pineal tumors form in or near the pineal gland. There are several different kinds and grades.

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