I do not have cavities but a lot of nodules on both lungs. I had a CTscan last week and the results show there is no change and things are stable and the mucus plugs are still there like last time. I understood that taking antibiotics should make some change for better. The doctor says it is good news but do the antibiotics even work? I do not cough up anything, sometimes a tiny bit of clear stuff so its never enough to send to the lab. I keep sterile cups at home just in case but there is nothing. So practically the doctors do not check if my MAC converted and i am very nervous about the situation. Has anybody experienced something similar. I am seeing my pulmonologist in two weeks.