If you haven't already received answers to your questions about your MRI, if you have the radiaologists comments from the MRI, review those notes and google every medical term you are not familier with. Something like "what is spinal stenosis" or "what is blah blah blah". You will instantly get very acurate descriptions in lay terms that explain the medical term you don't understand.
It was helpful for me to be versed on some of this before I met with the neursurgeon to review my MRI. He realized that I understood what was going on in my spine. I hope this helps you or anyone else who is seeking answers to these complicated matters.