I apologize, I didn't clearly state my initial post. I meant an epidural for an MS patient with pain from DDD, etc. I didn't mean to treat the actual disease process but treating the patient for pain symptoms, keeping in mind this statement from an article from the late 80s.
"It has also been recognized since the 1960s that the epidural space is not wholly separate from the subdural and/or subarachnoid space. Many thousands of arachnoid villi subtend all the membranes from the intrathecal space, and many of these end in the large epidural veins. Therefore, the various spaces and membranes are not only contiguous, but continuous. It follows that an injection of methylprednisolone acetate into the epidural space does not guarantee that it will remain isolated there."