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A mediastinal mass was detected at age 65. I had no symptoms from it other than arrhythmias that came and went. I had a robotic thymectomy three years ago followed by radiation since it was invasive. I thought I was out of the woods since I had no symptoms of MG. Five months after surgery I began experiencing double vision and ptosis, saw a neurologist who found I was ACR positive and it was downhill from there. I have full blown gMG and have been fighting it since then. Steroids, Mestinon, Imuran, IVIg, then Vyvgart and Rituxan. The proximal muscle atrophy is severe and the diplopia is constant. But I still live independently and push myself to stay active and involved.