I know it's very concerning to read that and am sorry you're dealing with it. Just remember, If you don't have positive cultures, it's possible you don't have MAC. I was thought to have MAC based on CT's due to nodules, trees-in-bud, bronchiectasis, etc. To everyone's (local pulmonologist and Mayo's) surprise, my sputum cultures on bronchoscopy were negative for MAC-just normal flora.
The radiologist still said findings consistent with MAC on 2 CT's after that.
I know I'm lucky, but just wanted to share a bit of hope.
I do daily airway clearance for bronchiectasis to reduce risk for infection. .