After spot was seen on the right upper lobe of lung I had MRI, and petscan and finally bronchoscopy which found toxic mold. Now I take Ctscan every few months to check the spot, It is stable but last Ctscan found ground glass appearance in a nearby area. I am coughing but not having breathing problems. I will see the Dr. next week, but he doesn't seem to give me answers.This has been going on for a year and a half.On looking this up find all kinds of answers..what is the definitive test to see what this is?