Re: cord impingement - what next?
Do you have a copy of your MRI report? If so, please copy it off and post it. Then we can try to answer your questions a bit more accurately.
Briefly though, if there is cord impingement in the thoracic or cervical area, there is always the danger that if anything worsens, the spinal cord could be permanently damaged, resulting in possible paralysis, etc. It all depends on the extent of the impingement, what is causing it, etc.
(It is always the unintended consequences that one worries about with cord impingement: things like a fall, getting rear-ended or in a traffic accident, etc.)