Questionable small density at the left upper lung field and linear atelectasis is superimposed on the left hilum. What? Cancer? Remainder lungs clear.

Possible. The possibility of cancer is almost always there. The risk depends on the smoking history, family history of cancer, the size of the mass, etc.. Smokers are at higher risk. Certain cancers are familial. Larger spots and those with ragged edges are more likely to be cancerous. Consultation with oncologist or lung specialist may be considered..