Thanks Harrison. I've seen various versions of this chart before. What are the little blue dots for?

Midline
 

It is my understanding that "midline" issues are harder to heal and more likely to reoccur. If I were you, I'd ask more about the midline findings on your MRI
Good luck

PS. Helpful sites:
http://www.chirogeek.com/Herniation/...tion-page.html

http://www.chirogeek.com/Sciatica/dermatomes.html