I can understand your being nervous. But, all things considered, it sounds like you are getting excellent care.
Just because you are going to see an oncologist does not mean you might have cancer. Oncologist treat many different diseases.
As a matter of fact cancer of the thymus is very, very rare.
In adults there are many possible reasons for the thymus to be enlarged. It can be due to a cyst (fluid filled sac), a thymoma (benign growth), or fat in the thymus.
In adults with an enlarged thymus doctors are concerned about possible Myasthenia Gravis so they will be watching you for any signs of this condition.
So. What is the take home message?
Continue to follow your doctors advice. I bet things will be OK.
Does this make sense to you?
It's safe for you to press the positive feedback button now if you so desire. And, never fear, even after you press that button I'll still be right here to continue helping you, but, as I do work for tips, I want to make sure you are happy before rating me.
Dr. Rick MD FACS