@upnort Have you consulted with the Regenerative Medicine researchers at Mayo? If I am understanding correctly, there is a white area that shows damage within your spinal cord itself on the MRI imaging of unknown cause and they have not definitively linked that to your symptoms?
https://www.mayo.edu/research/centers-programs/center-regenerative-medicine/focus-areas/neuroregeneration
https://www.mayo.edu/research/documents/neuroregenerative-medicine-booklet/doc-20092381