cranial cyst

I am a 30-year-old female diagnosed with dystonia. I have dystonic episodes approximately once to twice a month. They can range in time from five minutes to an hour-and-a-half. Upon diagnosing this disorder I had two separate CT scans done of the brain both of which confirmed cranial cyst (arachnoid cyst) in the right posterior fossa. This was shown in 2007. I had a CT scan done in 1996 and no mention of any cysts to my mother or I. I am wondering if the dystonic disorder that I have could be related to this cyst or if the neurologists I have seen are correct in that the dystonia is as a result of my treatment for infertility with the medication Clomid. The last CT scan the radiologist reading it recommended an MRI for further evaluation. No one has ordered such a test. Should I ask for one?? Any suggestions would be helpful.