I had bilateral breast cancer and ct with rt. now ct scan showed atelectasis or infiltration in the right middle and left lingula. er doc said it's ok?

Atelectasis: There are a number of reasons for atelectasis (collapse alveoli or air sacs) or infiltration (areas of inflammation) in the lung: infection, mucus plugging, or shallow breathing. Though the cause is most likely unrelated to your cancer, lung cancers or recurrent breast may sometimes appear as infiltration. Best thing to do is to schedule a follow-up visit with your oncologist for evaluation.