My oncologist and the radiologist both say there is no explanation for the activity from my PET scan and brain MRI other than the cancer being back. But, I went over my scans with a new radiation oncologist and he agrees with me that there is a possibility the brain mass is scar tissue and that the left breast hot spot is an anomaly. See, it doesn't FEEL like the cancer is back. So, I am not giving up my status as NED or NAD yet. Watching and waiting...