Heather, There's been a fair amount of discussion on this topic. Some people hope for a thymectomy because it offers a chance for remission, improvement or elimination of all MG symptoms (for a small percent). In many cases, the MG symptoms lessen or disappear a few months after a thymectomy.

As far as the question of malignant vs benign, it may not be that important. I think thymus tumors typically start out as benign but can change over time to become a malignancy. As long as the tumor is confined to the thymus itself, it's a low risk event and the cure rates are very, very high whether malignant or not. Several types of cancer can unfold this way. An example is 'pre-cancerous' polyp that can develop into colon cancer. If it is removed, it never develops into cancer, but if it goes undetected, it can be a big problem.

It's possible your MG symptoms served as a warning to catch a problem with your thymus early and before it can ever become malignant. I believe this often is the case. If so, they will likely offer a thymectomy and you will have a good chance of reducing MG symptoms and a very, very good chance of never having to worry about a future malignancy. Thymus tumors, when detected early, are reliably cured.

If they do offer a thymectomy, you should ask about different options to perform the procedure. Several people on this forum have said good things about a minimally invasive method called VATS where the procedure is done with a robot through small incisions in the chest. A thymectomy is major surgery but the VATS method offers a much faster recovery.

I wish you didn't have to worry about this during your pregnancy. It doesn't seem fair at all. Wishing you strength to make the best of it. Keep us posted.