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The second X-ray was done to get a more clear view of the upper lobe in order to be able to measure the lung opacity clearly and visualize it better.
A well defined opacity in lung can be due to pneumonia, cancer, tuberculosis, a benign lung nodule, or due to an infarct. Less well defined or diffuse opacities can be due to inflammation, tuberculosis (military type), asbestosis, silicosis, auto-immune diseases etc. Usually most lung nodules that are not calcified are benign if they are less than 10 mm in size. Also, the possibility of nodules becoming cancerous increases with history of smoking/current smoking/previous history of cancer/family history of cancer. One can get multiple small non calcified lung nodules and they may all be benign. If you are in otherwise great shape, then you will need annual follow-ups. Any change in size, density, appearance of nodules, calcification etc will need further follow up, and maybe closer follow-up.
Please consult your PCP for primary examination followed by proper referral.
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