He has had all kinds of test, and all of them were negative (tests included MRI, MR Spectroscopy, lumbar puncture (spinal tap), head/neck CT, metabolic panel, various blood tests, and genetic tests for specific disorders). No positive tests to point us in the direction of a specific disorder. The only thing we know is that he responds to dopamine, which means he has dopa-responsive dystonia, Parkinson's, or a dystonia-Parkinson syndrome. Really, the only way to pinpoint which one it is would be to find an exact genetic match to a specific disorder. All of the main ones that fit his symptoms have been eliminated.