I have MS, so on MS forums there are usually questions about Transverse Myelitis.
link to this info is below
Transverse myelitis is a neurological disorder caused by inflammation (swelling) across both sides of one level or segment of the spinal cord. Inflammation can damage or destroy myelin, the fatty protective substance that covers nerve cell fibers. This damage causes scars that interrupt the communication between the nerves in the spinal cord and the rest of the body. Most people affected by transverse myelitis will have only one attack; a small percentage may have more than one attack.
Transverse myelitis can appear as the first symptom in conditions such as multiple sclerosis (MS) or neuromyelitis optica (NMO). A person with transverse myelitis who also has an abnormal brain MRI with more than two lesions has an increased chance (as high as 90 percent) of going on to develop MS.
If testing and examination does not suggest a specific cause for the condition, the diagnosis is presumed to be idiopathic transverse myelitis. This is the case in 16-60 percent of people diagnosed with transverse myelitis.
https://www.nationalmssociety.org/What-is-MS/Related-Conditions/Transverse-Myelitis
Is MS a viral disease?...............
I love the medical term “idiopathic.” It’s shorthand for saying “we don’t have a clue.”