I had my first MG symptom (actually, only MG symptom), ptosis, the last week of October, 2011, extremely high off the charts antibody results 2 weeks later and a trans sternal thymectomy on December 20, 2011. Surgery was strongly suggested because of a CT scan showing my thymus to be enlarged. (It ended up being 9cm by 9cm) Within 3 weeks of my surgery my ptosis was gone. I stopped taking Mestinon about a month later. My antibodies stayed extremely high until 3 months ago and now they're just "high". There are some schools of thought that believe that if the thymectomy is done shortly after MG appears, the better chance of remission.