Thanks for the info. Radiation ended in August 2001 for my mother. Turns out the radiation didn't do it, so she had surgery (mouth, jaw, tongue)in Feb. 2002. She has had 2 Pet scans since that surgery and the doctor was not concerned until the latedst one. The first was in the Fall of last year. Hopefully it will be scar tissue from the radiation as you suggest, but would it take this long to show up on a PET scan? As you can imagine she is worried and is dreading the outcome of the biopsy tomorrow.