It sounds like you are separating out neuro-immunology from MS, which suggests that you are actually referring to autoimmune neurology, which is only a fellowship at a few tertiary/quaternary care facilities. I agree that it is very interesting and a great future field but I would disagree with “incredible” lifestyle outside of perhaps a select few people who have a really good research/clinical combo gig. Those patients are very complex and require a lot of detective work and management outside of the actual billable hours. Many of these docs in academic institutions are always being called about complex cases in the hospital and getting referrals for anything that other neurologists can’t figure out or are too lazy to figure out, so you have to be familiar with very broad differentials including genetic syndromes sometimes requiring whole exome, etc. The “autoimmune encephalitis” that isn’t responding to PLEX might just be primary psych or Niemann-Pick type C or LBD. But it’s complex so it “must be autoimmune” and it is your job to prove the negative.
Again, it’s an awesome field, but definitely not one to pursue for lifestyle or money. Sure, you could combine it with other specialties that have associated procedures, but there is an opportunity cost to doing fellowship.
Based on your posts over the past several months, it sounds like you will benefit from more real world clinical experience. You have posted so much about salary, various random fellowships like critical care EEG or pain/EMG or combining heavy-duty academic research with weekend telestroke. To be honest, I was the same way and would spend a lot of time just researching all the possibilities and trying to plan out my future career. It was fun. Also I was of the mindset of “it won’t bother me if I do a few years of extra fellowships” or “I want to combine two totally random fellowships because it could be useful”. I was drawn to the craziest cases but realized that if you want to see the most complex cases at an academic medical center, it will become your life, it will be very hard to take any vacation, and you will be paid less than other neurologists who don’t even put 25% of the thought into cases that you do. Also you will be involved in research whether you like it or not. I really respect those doctors but ultimately found it wasn’t for me. The only thing that helped me decide was time and clinical experience—not opinions of other people on a random forum. So I would recommend keeping that in mind instead of being so hyperfocused on something that can’t be solved from browsing the internet. Even though it’s tough.