Just a comment here. I found Chris8515 comments interesting because I had something similar happen to me after lung surgery followup (about a year later) the radiologist said I had ground glass area in my lung (lower I think). My Pulmonary specialist looked at the scan and said that is NOT (emphasis the pulmonary specialist) what the scan is showing. I have had a couple of more scans but never heard anything more. What exactly is 'ground glass'? Does it ever just come and go? Is there something else that often resembles it?