I would take your latest MRI and see another Neuro SURGEON and see what he has to say.
Since you say that the cervical curvature is non-existent, I would think that might have something to do with it, and also the discs would probably be involved, but I don't know since I haven't read the report.
So see a Neurosurgeon and let us know what he says. Best of luck & God bless. Hugs, Lee