DEAR DR. ROACH: I’m a 74-year-old female who smoked a pack a day for 40-plus years, having quit smoking about 18 years ago. As a precaution, I asked my primary doctor to order a screening CT scan, knowing that I’m a candidate for lung cancer. The results showed a 3-mm nodule in one lung, and … Continue reading Alarming rate of false positives plagues lung cancer screening