@lori7034 - Your story his close to home. I am so sorry that you have had a set-back for your knee surgery. I will be praying that the lung lesions are merely scar tissue.....I have COPD at a Stage IV, but not yet on 02, as my inhalers appear to be working well and I started on Dupixent and had lung valves inserted. Can't imagine dealing with yet another health problem. My prayers and thoughts are with you!