I don’t have MAC, but do have mild adult onset asthma and mild bronchiectasis. My only symptom is a cough and I had it for a few years before I had the abnormal CT and subsequent pulmonary work-up. At Mayo for second opinion, they changed my inhaler to Advair and it was like miracle drug…that little nagging cough disappeared.
Did they do a methacholine challenge test during your PFT? That’s how mine was diagnosed and pulmonary doc said other docs had missed it before because they didn’t do that.