Can anyone tell me in plain English what CNS Lupus is, does and is treated?

They are fairly positive I have MS but there is a question of if it may be CNS Lupus. My LP showed ANA (or is that ANNA) in my CSF - not super high but definately above normal ranges. From what I can garner MS and CNS Lupus can present fairly similarly.

I can't seem to find much that isn't either 1) "...the most serious form of SLE disease with a poor prognosis. {and that's it for info}" or 2) written in medical jargon to hard to understand

Much thanks to anyone who can shed some light on this for me