[gchappel]

I am a radiologist- almost retired.
I retired as a partner from a large group- 50+ rads. I still work a little part time.
When possible, we assigned exams to rads by their subspecialty. Spine MRI would be assigned, when possible, to a radiologist with subspecialty neuro training. Not all groups have that capability.
If they actually missed something large like a fusion, you can ask for it to be reviewed. It is usually easiest if your doctor asks. At least with us, those would be assigned to both the original reader and if a review was requested by your doctor- would also be assigned to a different second rad. An addendum would be produced.
It may really be difficult to find a different group to reread your exam. Believe it or not, many groups use different protocols- so images look different. It is a legal nightmare- if we disagree on anything. Plus, no one will pay for it. Your insurance will not pay- they already paid once. Our group would not do it.
Tough situation- but you, or preferably your doctor, could call and ask for a review as significant findings were missed.
Good luck
gary