Terry,
Firstly, don't panic. There will be many more "anomalies" in your journey and the fight against the mets has just begun.
I have squamous cell skincancer that went rogue. 4 operations, 2 bouts of radiation, and 3 cycles of chemo. Many MRIs and CT scans and X-rays. On one of the films a spot showed up on the bottom of both lungs. 6 months later they were still there. On one of the repeats a shadow showed up on the upper part of the lungs, that wasn't there before. Correction they missed it before. The docs all started to panic. It took some time but I remembered that i had a very bad dose of 'flu when I was seven. That was in 1945. Because they did not have antibiotics in those days, readily available, I had an old fashioned cure done to me. But it left a slight scar tissue on the top of the lung.
A lot of panic over something that was able to be explained. They are still there and haven't gotten any worse. So hang in there
Regards,
Pluv