Here is my issue with this. If AI diseases cause SNF, then we should know that....we should not just label it a name reserved up to this point, for a condition present when all other conditions have been ruled out.

Also, fibro does not have the same clinical ramifications that SNF has....including paraneoplastic PN.....

I would think Fibro would be a possibility in the absence of SNF....in the presence of SNF, it seems to me, moot, since SNF would cause the pain and the autonomic dysfunction.

I can think of no cheaper diagnostic test than pushing on tendon insertions...which btw hurt in 'normal' people. If they skipped all other diagnostics and just did the skin biopsy, my thought is, they would find a large number of people with SNF.