When I was diagnosed in 2010, I had multiple ground glass and solid nodules. Many are still there and remain unchanged some disappeared, some got larger then smaller. It's estimated that 85-90% of nodules are benign and will remain that way. They can be caused by an infection that affects the lungs, or allergies. They can also be caused by environmental influences-air pollution, cleaning fumes, VOCs in scents and room air fresheners. There are thousands of things that can caused them.

Their appearance is important, too. If that smaller nodule had spiculations, or other traits that suggests cancer, it is likely they would have suggested a wedge resection or a lobectomy. They will do regular follow up CTs to monitor for any changes.

With regards to the breast cancer, did the oncotyping indicate the need for hormone suppressants? I ask as someone who has had both legs ng and breast cancers.