Negative chest cat scan for rib fracture but radiologist recommends mri with contrast of thyroid for my 12 year old. i'm not getting a reason why?

Not a clue: We do not have the history, exam or CAT scan to review, so we could only guess that something in the cat scan was suspicious. I'd call your doc, who might have received a call from the radiologist.One of the problems of these advanced technologies is they find stuff we weren't looking for that points out a need for another test.Some of the stuff is worrisome, some turns out to be okay.