I would like to add that my hubby's recurrence was found on the first annual PET scan. No one has been able to determine "conclusively" that it is cancer...but highly suspicious. I wish they had done a PET scan right after he finished surgery and treatment so they could see the "new" landscape in his neck. I do not feel confident that the recurrence in his neck is not a false positive. A biopsy has not proven conclusive. He feels fine and looks fine. ?*&%$