I am not certain where you are located, but most recommend getting second opinions with major cancer centers like MSK, Dana Farber, MD Anderson and such... Those folks see everything and can provide extra confidence in what they are seeing with all of the data points together, old and new scans ect.
Most insurance covers this and these facilities are in nice locations you can catch a game, a show, or a great meal out:) As President Reagan said, "Trust but verify."
I know that my wife's scans show some lung scaring but they do not consider the items of interest cancer mets until the size changes or other corroborative evidence is present. My wife is an "Olymphian" Stage IV athlete, so lung mets have not been her primary issue though.
The summer weather is here, so find a secondary reason to go to the big city and do something else more fun when you get your second opinion. Let us know what you learn, but always trust your instinct if you think you need a second point of view.
D/H 47 years old, 10/2014, Stage IV M/CRC, nodes 12/15, para-aortic, 5 cm sigmoid resection, positive Virchow. KRAS mut, MSS, Highly Differentiated, Lynch Neg, 5FU/LV and Avastin 1 YR (Oxi for 5 months), Zeloda/Bev since 01/2016. 02/2019 recurrence para-nodes, back to 5FU/LV Oxy/Bev. It is working again. "...Perseverance is not a long race; it is many short races one after the other."-Walter Elliot