Hi, Trish:
Let me add to the general conclusion that answers your question regarding MRI scans, pre-op. It's basically the doctor's call.
My neurosurgeon is very conservative and cautious, which is fine with me. I had my original MRI scan in mid-May, 2006 and my surgeon ordered a 'fresh' MRI scan just a few weeks later, immediately prior to my surgery. He ordered another MRI following the surgery (to check his work, as he put it). I've had 5 more MRI scans since then, some connected to my follow-up FSR treatments. Fortunately, the MRI's have shown tumor shrinkage and the beginnings of necrosis so I'm good with this. Besides, I'll be going to annual MRI scans after my next one, scheduled for June.
Again, if the surgeon wants you to have an MRI, it's going to happen. It really isn't a bad idea. As Steve suggests, just play along.
Jim