Firstly, it is very common for people to have small harmless lung nodes as a result of current or prior infection or other reasons. Unless there is some other reason for concern, watch and wait is thus the usual response. Sounds like they think these nodes are probably harmless. If the largest one is 6mm, it seems doubtful that they would light up on a PET. And if they do, doesn't inflammation light up as well as cancer?
ETA: I had one show up the first time I had a thoracic CT. Watch and wait. Nothing happening. They seem to think it is granulated, non-threatening.
F, 64 at DX CRC Stage IV
3/17/18 blockage, r hemi
11 of 25 nodes,5 mesentery nodes
5mm liver met out
pT3 pN2b pM1
BRAF wild, KRAS G12D
7/9/18 CT NED
11/20/18 CT NED. Enlarged spleen.
12/20/18 Liver MRI 5mm liver met? and 2 lymph nodes in porta hepatis
6/5/19 Triphasic CT LN and spleen normal, Liver node stable
6/28/19 Pause Keytruda, predisone for joint pain
7/31/19 Restart Keytruda
9/10/19 CT stable