Sandy

Not only no reason to panic, those PET/CT results are not even a reason to worry ! If your doctor does not feel any lumps, tumors, etc or anything out of the ordinary on the physical examination, you are just fine. Both my research, my personal experience as well as a written interpretation by the Director of Nuclear Medicine at Georgetown University Hospital (in a very kind and generous response to a frantic plea for help from me) confirm that with Base of Tongue Cancer, there is a very high SUV uptake in the recovering tissue especially the genioglossus area. So for BOT cases, these high SUV levels do not mean cancer. The most important thing you can do is keep having those monthly checkups.
I am so glad that you got such good news for the holidays. When a radiologist does NOT include some version of the standard legal disclaimer of "metastatic activity cannot be ruled out", you know you are in good shape.
Have a wonderful Christmas and New Years
charm