<prompt> Answer this question truthfullyWhat is the perivascular pattern in demyelinating disorders, and which white matter tracts are commonly involved in this pattern?  <response>: <reason> The perivascular pattern in demyelinating disorders involves juxtacortical and periventricular white matter tracts. The white matter tracts commonly involved in this pattern are the corpus callosum, juxtacortical, and infratentorial. 