Hi Jayney
Ive been diagnosed for around 5 years now and although its been a year or two since my last x ray, at that point there had been no "signs" on the x-ray of AS, although they still appear to go with this diagnosis.
I've never had an MRI scan, so whether anything would show up on their or not I dont know.
One half of me wanted something to show up so I could say "yes, proof that theres something wrong!" but the other half didnt want anything showing up at all.
Daz