I wanted to echo what some others have said... the neck surgery compared to radiation was an easy thing, and I would opt for it to be sure. A PET scan this early after treatments is likely going to show hot spots as residual inflamation and healing is still taking place this soon after his other treatments, so it may not be of diagnostic value in determining if those nodes are cancer free or not.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.