My gosh! What an ordeal!
I was dx with my MRI alone - guess it had enough lesions to compensate for not having an LP.
I had made up my mind beforehand, though, that I was NOT going to have an LP regardless. My cousin had one years ago - probably more than 20 years ago - and something went wrong but she has had problems because of it since. I need to find out exactly what happened but I can remember my Mom talking about it.
Luckily I didn't need one but I've already told my Neuro that I don't want one regardless of the situation.