Similarly, a radiologist’s incidental finding of tree in bud in my right lung when reviewing my calcium CT was said to be suggestive of MAC. The results of a sputum culture came back today with AFB present but not yet defined as MAC. I’ve had no symptoms other than getting winded more easily when being physically active and fatigue in the early evenings after work. My mother lived with MAC for 14 years and the last 3 or 4 were miserable for her. While it isn’t a hereditary illness, I suppose there may be genetic traits, that make someone more susceptible to contracting the illness. I’m glad to find this message board to check in with others about their illness experiences.