This is not the doctor moderated forum, this is:
http://www.medhelp.org/forums/Head--Neck-Cancer/show/323 (look for forums under Expert forum, we are patients like you).
That being said, you have had this lesion show up now on several MRIs, so just being an artifact (e.g. weirdness) of the MRI is pretty much ruled out. MRIs are not perfect especially with smaller lesions (and CTs will not pick those up well either, from what I understand).
Sometimes it is not size, but location that makes things difficult. As they think you are ok, they are not willing to mess with anything as well, the treatments are going to be worse than your current status quo.
I too have heard a lot of debate with the new MRI (3T) vs standard (1.5T)... some docs are not in favor of the 3 as they say it presents too much too look at! I have had MRIs done with both, and to me, I prefer the 3T for clarity as well as I would think the offices using it are more up on the latest technology. I had one tech tell me the 3T was not available in clinical use (huh!) and that they were not going to get it because they thought patients would get dizzy afterward. I told him I had had a few, and his information was flawed.
As for dysplasia - possible. Are the docs sending out your films for other opinions? Or are you doing all the work?