Bronchiectasis.
Steelbranch,
In the "Military Aviation" Forum, look up "Gaining a RAF Pilots Brevet in WWII" (usually on Page 1 or 2). Go to Page 188, #3757 et seq, for my story with your problem.
60 years ago, true, but the prognosis is still the same. The thing is irreversible. The only real answer is excision of the lobe - in my case left lower basal. Have a good long chat with your Consultant. (My lung spot is no worse today than it was then).
Best of luck,
Danny42C