most of the time your MD will get a phone, or email/fax report from the prelimb saying stable, or no obvious changes pretty quickly. then about a week later a radiologist will comb over it and compare it to the last or last several MRI's then they get into the finer points of lesion vs lesion.

Maybe your MD didnt have that full report in front of him at the time, and just wanted you to have the update of stable that he got.

hope that helps. I would still call and discuss it.