You need to read up on why a PET scan works - it has been discussed here before, but I'll do it again briefly. ALL cells burn sugars. Cells that are working harder than normal (inflammation, infection etc.) burn it faster than normal, they have a faster metabolism. Cancer cells burn it very rapidly as they have the highest metabolism.

They inject you with a radioactive glucose formula and you lay around for an hour so that the cells in your body can have time to absorb it. Those that absorb the most of it show up on the scans. These MAY be cancer cells or they may be an area that is healing or inflamed for other reasons, hence the high rate of false positives with PET scans right after treatments. My annual PET shows my hips, knees and other areas of chronic inflammation from beating myself up over the years as hot spots. Last PET I also had some nodes in my chest light up but that was determined to be aspiration pneumonia

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.