I applaud your research efforts. I think the "up to 90%" comment tells the story. I had nodule (RUL) removed sixteen months ago. It was spiculated, and it was malignant (stage 1b). The wording on the CT scan can be informative. My first CT scan noted it was spiculated and said it could be cancer, scarring or something else. (I had quit smoking 20 years before). The CT scan suggested a PET scan and the PET scan "lite up" in two areas. I had biggest nodule removed 16 months ago and now about to remove the other.
I have multifocal lung cancer so have other nodules that are considered cancer and they wait until they get to a certain size before treating. They want to preserve lung tissue. They monitor nodules with CT scans but also check them with PET scan which tells a lot.
If you have any doubts, seek a second opinion. I did. Look for Pulmonologist with specific focus in lung cancer.