Could be another demyelinating disease.

Which means it's secondary demyelination.

That's had promising results with demyelinating diseases.

Could be demyelination from toxic exposure.

TAUB: No idea. Could be another demyelinating disease.

MS, toxins, any one of 100 demyelinating diseases.

What is the demyelinating CNS disorder associated with the JC virus?

He was in an acute confusional state, which doesn't fit with a demyelinating disease like M.S.

A picornavirus could cause localized demyelination that the MRI wouldn't pick up.

Which means it's secondary demyelination, which means the source is somewhere else, which tells us it's not a nerve disease.