Had my thymectomy in 2005 - my CT scan showed no abnormality either, but lab tests showed Stage II malignant tumor in thymus - had to have 28 radiation treatments.

DV better until about a year ago - have had to wear a patch for the last 10-12 months. Get IVIG every 1-2 weeks, depending on how I feel

I agree with the other posters, he needs to be as stable as possible before surgery because it is a major surgery.

Good luck with your decision!