What does it mean when a PET scan lights up?

Related questions

1. What can a PET scan detect?
2. Can PET scan detect cancer?
3. What is FDG activity on a PET scan?
4. Does arthritis show up on PET scan?
5. Can PET scan detect all cancers?
6. Does liver cancer show up on PET scan?

Tags

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2. #cancer
3. #recent
4. #there
5. #unlikely
6. #uptake
7. #tracer
8. #however
9. #might
10. #detects
11. #means
12. #definite
13. #meaning
14. #infection