@hercules
The specialists can not say exactly why I have patches of ground glass appearance. They come and go and usually don’t show in the same place. One explanation is inflammation of some kind. I have dealt with episodes of GI autoimmune inflammation.
There have also been nodules, most quite small, but there was one around 8-9 mm. As per protocol regarding pulmonary nodules I had regular CT scans, every 6 months. No change noticed until last year when it had grown to be more than 10 mm and also changed appearance. It now looked like adenocarcinoma, a fairly slow growing tumor. A biopsy confirmed it. PET scan did not detect any spread so it was a stage 1. I had the option of surgical removal or radiation. I decided on radiation- outcome would be the same. I now have CT scans every 4 months. All stable. After the first year or so the scans probably go to a 6 month interval.
I feel very lucky that it was discovered because of a chest X-ray after pneumonia treatment.
I have had a pulmonary doctor for many years, for asthma. He now also follows my scans along with the oncologist.
In your case I think 12 months is too long to wait. Do you have a pulmonary doctor?