We had a young patient in his 30s last year, a pineal cyst was found via MRI. It did clearly not look like a pineoblastoma, pineocytoma nor a pineal germinoma, and the classical protocol doesn't suggest surgery. During the year, the cyst was growing, and the patient developed slight hydrocephalus (because the cyst was compressing the cerebral aqueduct) and symptoms like headache, nausea and vision problems developed. Now - has anyone seen patients with pineal cysts? Any changes in patient's behavior? Anyone with experience in the surgery?