Myalgic Encephalomyelitis is clear to see in the blood

[Oliver3]

I agree a spinal tap is not sufficient.
The vast majority have a myriad of problems not just limited to thr brain.
I.e vascular issues, , muscle issues, immune deficiencies, hormonal issues not directly related to the brain ir in feedback loops, collagen issues, leaky gut issues. You really can't say this disease is exclusive to the brain