Hi TK! Welcome to NT!
I don't know the answer to your question. I know that some MSers on here have had transverse myelitis in relation to their MS. Hopefully one of them will come along soon to answer your question. I know that myelitis happens in the spinal cord and MS can cause myelitis as can other conditions. That's the extent of my knowledge on it.
Please let us know how your testing goes and what the results are. Hang in there!