Sharlee, I don't know what your doc means by "real hot spots" but PETS are sensitive to the point of being oversensitive and if the report,as well as his glance at the images, show no hot spots, that is very good news. The fact that nothing shows up on the CT is good news.
You haven't taken antibiotics for this yet, right? If that's so, it does make sense to me, given the CT and PET results, for him to treat this as though it may be some kind of abscess before doing a biopsy. I am hoping for you that that's exactly what it turns out to be since even if you have to have a root canal that's a whole lot better than ahving to have radiation.
Overall, this sounds like hopeful news to me although I know it's frustrating to not have certainty. i'm glad your freind's delivery went OK. That's a lot tp deal with--having a new baby and recovering from surgery removing the appendix and gall bladder. I'm sure she is grateful you were there for support.
Nelie