Expanding on my latest MRI

I went and saw my neurologist last week, and he is extremely pleased with my MRI results. He confirmed what the radiologist @ NW Comm said, that there was no enhancing activity, which I basically take as my MS going into remission thanks to the Tysabri. It's good stuff, now if they could just figure out why it is associated with PML. Man, I don't want to get that!