dtm74,
I’ve also heard cancer can return, and when it does it can be to the surgical site or incision. I’ve had numerous recurrences myself, in areas that were previoiusly treated, that were deemed recurrences since they occurred less than a year, and had the same pathology. At this point, they may consider this a secondary cancer, not sure though, due to the time distance from the first cancer or it can you may have a different pathology from the first cancer, which may mean nothing to us or change treatments, but it may be something you hear or see on a report, so you may want to review the pathology report from the biopsy, I always get a copy anyway, or ask the dr, the type of cancer it is like squamous cell carcinoma probably like the first, tumor grade, etc.
Good luck with the PET scan.