Hi K- CT scans, as a diagnostic tool, are very helpful in highlighting anatomical abnormalties. PET scans, as a diagnostic tool, are very helpful in highlighting metabolic abnormalties. If detected, I would think that your doctor would order a biopsy. If found malignant, the doctor would need to order additional tests to determine staging. It is the stage that dictates treatment protocols.
I hope this was helpful. I share with you the anxiety and grave concern. I want you to know that their are many treatment options available. I want you to know that their are also very well-meaning people on this board who are willng to provide support.
Best to you and family... Tom