Thanks, Brian. I'm sure the resources you mentioned to look into will be very helpful.

I'm in the process of gathering all the records from prior treatment now. If my recollection is accurate, though, the only PET scan he had was after the diagnosis and before the treatment began. All was clear. It seems the oncologist did not endorse the suggestion of a repeat PET after treatment. I can't recall that any other scans of the neck of been done post-treatment until my husband noticed the lump in his neck.

Surgery was not mentioned at all after treatment.

Thanks again for your support.

Loretta