Hi Phil
Was it a CT or PET/CT? Sounds like it is growing slowly...not what you wanted to hear, but slowly is better than quickly and that is still very small. We have done the lung spots a bunch now, and at 6 mm on a CT I know Pat's oncologist would be talking treatment to get it before it gets going. We have resolved lung mets several times when they have been small.
We had success with lung mets with the cisplatin, irinotecan, docetaxel infusion regimen. The most recent bout responded to Oxaliplatin and epirubicin via infusion/push and oral Xeloda. Pat has a port which makes the chemo easier to deliver when he needs to treat. He also had some hydration issues during treatment and the port makes that a lot easier since access is difficult when someone dries out.
Good luck. Stay positive. You will beat this!