@Murph I wanted to add my two cents (maybe three cents LOL) and hope that it makes sense
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1) My first thought is that the patients who are gravitating toward pursuing the MRI's and testing for CCI are those who resonate with the list of symptoms and experiences described by Jeff and JenB (two very reliable sources). In my own case, I started to become curious b/c I have chronic, severe neck pain which originated from a car accident when my car flipped upside down in 2006 but has worsened with each passing year.
I have the same doctor as Jeff and he asked me a list of very specific questions and from my replies he felt strongly that I did NOT have CCI (which I agree with). He did, however, feel that it was worth getting a regular supine MRI of my neck to see what was going on and if it could be helpful in my PT. If I did not have the severe neck pain radiating down my right arm (cervical radiculopathy), I would never have just randomly gotten an MRI.
I think people gravitate toward what resonates for their personal cases and symptoms. As an example, when I first joined PR, there were literally endless threads re: Lyme, LLMD's, and Lyme protocols. I rarely (if ever) read those threads b/c I knew that they did not pertain to me (after having two completely negative Lyme tests in 2010 and 2014). But many pursued the testing and protocols b/c they'd had known tick bites, or positive Lyme tests, and it resonated for them. (I am just using that as an example).
2) My second thought is that I do not believe that ME/CFS is just one disease with one trigger or one treatment that works for everyone (although I know this is a controversial statement). That is why there are sub-groups who can get dramatic improvement from a treatment that can cause near fatal side effects in other sub-groups.
3) I also believe the rate of mis-diagnosis is very high. I was diagnosed with ME/CFS in 2013 and 2014 by my former PCP, an Endocrinologist, a Naturopath, and even a Psychiatrist who said, "You are not depressed, you have something purely medical going on" and then said it was CFS like the three doctors before him. I spent three years believing that it was my diagnosis, and in the beginning I had post viral fatigue syndrome from severe Mono/EBV and it all fit -- the high EBV IgM+ titers, the POTS and autonomic problems, etc. But ultimately, it all shifted into autoimmunity that was weakening my muscles and breathing. It was Rituximab that gave me my life back and I believe that there are others out there with autoimmunity who can be helped by it like me (but I would NEVER say that it is for everyone b/c it is not).
4) Lastly, just b/c there are very few neurosurgeons who can properly diagnose CCI does not mean much of anything IMO. There are very few ME/CFS specialists, few POTS specialists, and probably even fewer MCAS specialists, in the United States but that does not make those few doctors any less real or legitimate. These are orphan diseases (all of them) that are just not well-known or funded.
5) I lied, I have one more point... After I was diagnosed with an autoantibody (Calcium Channel/LEMS) that is much more recognized and well-known, I STILL was not able to find a neuromuscular specialist who was familiar with it enough to provide treatment. The #1 logical next step was IVIG but none of the three that I saw were willing to let me try it. And none of them ordered a lung cat scan, which is critical with this autoantibody b/c it can often correlate with small cell lung cancer.
Ironically it was my ME/CFS specialist (Jeff's doctor) who said that IVIG was my best hope, and fought for me to get IVIG, and ordered the lung cat scan and other appropriate testing. He is not a neuromuscular specialist but he understood all of the nuances of my case better than any Neuro. So it does not surprise me at all that he is learning about CCI and working with Jeff, and similar cases, to get the appropriate testing (nor does it surprise me that the average doctor is not willing to put in the time or effort to do this, especially with the insurance battle).
I hope this all made sense and just wanted to provide an alternate perspective.