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Hi, Dr. Stan here to help. You need to discuss this with your Neurosurgeon. The fact that you have space but no fluid may require placing a shunt to carry fluid to the posterior medulla. The lack of cerebral fluid could cause your symptoms. Unfortunately you may need surgery to correct this problem. I am here to answer any additional questions you may have. Please leave a positive rating of 3-5 stars. This is how I am credited for my response. Thank you and feel better soon.
it is possible that it is a scar which needs to be treated.