This question is for my 79 year-old mother. She recently had a chest x-ray as part of a general physical and was then sent for a CAT scan of her lungs(specifically left lobe). Her doctor reported yesterday that the CAT scan results indicate "scarring" of the left lobe. He said, based on the CAT scan analysis of scarring, that he is not concerned, but the CAT scan was ordered to look for the possibility of lung cancer. He has advised a 3-month follow-up CAT scan to see if there are any changes. My Mother was diagnosed by the same doctor several years ago with mild COPD. She has been a relatively light life-long smoker. Other than occasional slight wheezing, she has no other symptoms and, except for osteoporosis, is generally in good health. Should we still be concerned re: lung cancer in spite of her doctor's remarks ? Thanks in advance for any information.