My son was hit in the head with a baseball last week and has a concussion. He had a CT scan the day it happened and we were told that it was normal. He is still having headaches, dizziness and nausea. He had an MRI yesterday. This afternoon the neurologist called to tell me that he has Chiari. We have an appointment with the neurologist tomorrow afternoon. I am trying to do research but am getting overwhelmed. Can anyone suggest the questions that I should be asking?