I’m curious about whether you’re concerned about the difference in the sizes from the ct scan to the pet/ct scan, if so I was told that the size can vary from one machine to another. Usually when you see the doctor you will be told what the next step will be, the larger nodule is too small for a biopsy so they will probably want to wait for another ct scan to determine any changes, my first nodule was 9 mm. and they decided to wait for change because it too was small, it actually took 3 more years before they diagnosed me with NSCLC, afterwards they did a lobectomy and removed the lung lobe. I can’t express enough how nerve wracking it was to have ct scans every 6 months but it is a normal procedure to watch and wait, on a brighter side the nodules he has are tiny and this is the best part of this situation because nothing beats early detection and thanks to better screening technology they have greatly reduced the risks of lung cancer and longer survival.