For what it’s worth, my pet scan also showed a couple of small nodules in lung. The doc says those are not uncommon and often are residues of infection and are usually not cancerous. They will be monitoring them in future scans to see if they grow or not

Stage 3 cancer of right side of tongue
Tumor: t2.
Lymph nose spread
Partial glossectomy and neck dissection (2/12/20)
Never smoker
Completed six weeks of radiation on 5/6/20