I have a pineal mass (looks cystic) that is 1.9cm. According to my MRI report, there is an indent of my midbrqin and hyperintensity in the cerebellum. Symptoms include: migraines, loss of peripheral vision in left eye, numbness in right leg and right face, "drunken" walking, and nausea upon standing too quickly. Also, pressure feeling in head. I am scheduled to have a spinal tap. my doc doesn't think the mass is causing any symptoms. What's wrong with me?