I had 3 week course and developed significant radiation fibrosis involving my pectoralis major and minor muscles, three of the intercostal rib muscles and chest wall. I developed pain, decreased strength and my right shoulder became more anterior to my left. Of course this is my dominant arm. I had Chest MRI which confirmed the fibrosis. Fortunately no lung fibrosis. PT really helped but I do have chronic pain which exercise, heat, and even voltaren ointment helps. My radiation oncologist did note that more long term effects were being reported. I also developed lymph edema after radiation which resolved with help of PT