1) The most common symptom is headaches, followed by vision problems, dizziness,
and balance problems,
and in some cases insomnia, nausea
and cognitive deficits, particularly if cognitive deficits are involved. More rare is numbness and tingling. In extreme cases, pineal cysts can result in loss of consciousness and seizure disorder. So please take this seriously, particularly if the cyst is causing intracranial pressure such as hydrocephalus.