I have a cousin who has acrachnoiditis after having back surgery quite a few years ago. It is not a pretty picture as she has suffered severely ever since.

http://www.webmd.com/pain-management...-arachnoiditis

Another person married to another cousin had that dye thing done. He died. I would be very wary of any of it.

And the lumber puncture seems to be to find out if a person has an autoimmune disease, etc.