what will cause lung x-rays to show up more white
As in your situation, solitary lung nodules often are detected on an X-ray done for another reason, and appear as round, white shadows on an X-ray or computerized tomography (CT) scan. Lung nodules are common. If you have a CT scan of the chest, about half the time, one or more small nodules will be found. They appear white because they are denser than the surrounding lung, which is full of air and appears dark. Generally, the smaller the nodule the less likely it may be cancerous (malignant).