Pineal gland cyst
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A pineal gland cyst is a cyst in the pineal gland. Statisically, these fluid-filled bodies appear on 1-4% of MRI brain scans. we are more frequent at death, seen in 21-100% of autopsies, though researches are not sure why. They are in most cases asymptomatic, and it is rare for a pineal cyst to cause symptoms. If they do, these will most likely be headache, visual disturbances, or hydrocephalus, which can be extremely dangerous if left untreated. Pineal cysts are not cancer and most of the time it doesn't enlarge over 2 centimetres.
Asymptomatic cysts require no treatment. Some doctors choose to monitor patients with CT or MRI to look for cyst growth but most doctors don't.