question: A PET exam result six months ago was recurrent cancer in the neck near the right side of my collarbone. I had had thyroid cancer that had been surgically treated removing thyroid totally three years ago. This week ultrasonic diagnosis confirmed the PET result. My doctor who is a specialist in breast and thyroid cancer initially told me six months ago to ignore the PET result due to its high false positive rates in general. At that time the chest xray and and the ultrasonic results were negative, or did not detect any. I am afraid. Should I go to a neck cancer specialiist?