Hi, I know this post I'm replying to is old now, but I had my thymus removed in 1992 even though there was no problem with it (it was done as part of another operation) and now, 17 years later I had been found to have an enlarged thymus - possibly a thymoma, so obvioulsy they can grow back. Unfortunately mine has grown back abnormal and I wish they'd never touched it in the first place. (the neuro says there's a chance it is scar tissue).I have MG-like symptoms, but it hasn't been confirmed. Now that want to take the thymus out!