Don,
My ENT removed my left tonsil during his gathering of biopsy specimans prior to any RT. He said cancer often hides in the tonsil. He didn't remove the right one as my lymph node growth was on the left and he thought the cancer must have started on the left side as well.
You sound like you have some background with this. Is 6.9 SUV high for a single remaining tonsil?