As in most cases we never know the origin of our disease's. At first I thought it due to the fact I took Symbicort for 3 1/2 years. Steriod's are known to fuel fungal infections. I have "permanent" cavity in the RUL that acts like a trap. Then I ran across this that seems to explain this mac/fungal relationship:
https://www.mdpi.com/2309-608X/6/4/346?fbclid=IwAR1lz6HRE61LjzFe6wpeUTt-9QC4Nd796LQ7R46ud76LQmq8r0VW5Oqm_U4
P.S. I'll never take a steriod again.