Hi, I was diagnosed in November with MS. I had an MRI which showed 6-7 lesions, one either being new or old (I don't remember). I also had a lumbar puncture done that further convinced the neurologist that I have MS. My half sister has Chiari and others with Chiari have me worried that I may have that instead of MS. I don't know what to think since they both share the same symptoms. I have an uncle on my dad's side and first cousin on my mom's side with MS so it is in my family. Before my MRI, but after my CAT scan, I did bring up that my half sister has Chiari and asked if that was a possibility, but was told by the doctor that it doesn't look like it. How do I know for sure? Thanks.