My wife has never smoked, never lived in a house where there was smoking. Usually a chest x-ray would show something, but in my wife's case, the lungs were clear! She had an elevated alkali phosphatase in her blood, which could indicate cancer activity, but could be other things, too. The doctos finally concluded by elimination after many tests that she had a disease that makes too much calcium.
That was in the spring. In the summer, she began to lose some dexterity in her left hand. Then her arm started hurting. An MRI of her chest area revealed a tumor on her upper spine. Then further scans showed about five different tumors in various bones of the body. A biopsy of the spine tumor indicated it was an adenocarcinoma, and not bone cancer. A biopsy of the leg bone, where they could get enough tissue, identified it is non-small cell lung cancer. Then when they looked back at the x-rays of the chest area, they could see a small shadow on the top of the left lung --that is all. They surmise the main tumor migrated from the lung right across to the spine, and then out from there. Weird, huh?
Best to you. Don