I just recently received my results from a Lumbar MRI. There were no major findings to account for my leg weakness. Am I wrong in thinking that the Chiari then is accounting for my leg weakness? I do have a small Syrinx in my cervical spine as well but was told it was small. My Chiari is 10 mm, 2mm bigger than my last MRI from June.
Something is causing the leg weakness. I'm not a doctor, I have no idea what. I think you should go for 2nd or even 3rd opinion. Keep in mind there might be a doctor who is more fimiliar with these conditions.
Best wishes.