I've been in remission 3 years ... NSCLC squamous. Had a new petscan. Oncologist explained that a contrast is injected. Any cancer will light up. He said a 3 is normal no cancer. My number is 8. Has anyone heard of this number system? I forgot to ask what the highest number is. For the last 2.5 yesrs I have been told the spot is inflammatoon from previous radiation. Anyway, I will have to go for biopsy.