1. My friend works for the head of two hospitals here - PETs they don't trust them too many false positives. (he's also a surgical oncologist) See if your ct machine is a 3 tesla machine that picks up the most minute findings. You can also pay to have a PET -though the drs may not refer to them as they like to have their tests in house and read by someone they know/trust.
2. I am always concerned... Keep a close eye on the area for any changes but I would seriously quiz your dr. To ease your mind
3. Ditto to what Donna said... I have a tiny gobble gobble on my un dissected side, full face lift on my dissected side!

I think it's from the swelling as both sides were radiated...
Good luck.