Uh, my opinion: yes and YES.....get a CT!! My sister had a CT with contrast.

One of the reasons I was stumped (I had read her CT report) -- it said "superior" mediastinal mass. Everything I had found said that the "anterior" mediastinum was related to thymoma. I am not a medical person and have no idea of the difference. I get confused when doctors/nurses say "distal" and/or "proximal".

I can't advise as to whether you need a new neuro. Thymomas ARE rare. MG is pretty rare -- and something like 10% to 15% of MGers are found to have thymomas. So we are talking about something that many, many docs probably only read about in books.