question: yes I had to ct scans on my lungs and they both showed a growth on my left lung. Had a PET scn done but they didn t show up a cancer.at least not right now but I know it is .I was also told I have it I my right lung now. the doc says in 6 months they will do another CT scan. What do you think I should do. Should I get a second opion. Can the Pet scan sometimes not show the cancer