It was a PET scan and the activity they found was in his neck. He had BOT cancer which spread to lymph nodes in his neck before. I'm just nervous because I don't see how they could have done a PET scan 3 months ago and it was clear, then he doesn't have anymore treatments and there's activity on this PET scan. It doesn't sound right to me. Am I crazy to be worried about this?

Secondary caregive to dad (70 years old). BOT cancer & lymph nodes diagnosed 12/11. 35 rad treatments & 4 erbitux. PEG tube. Non-smoker. Casual drinker.