Scar: Like any part of the body, the lung from previous inflammation can develop scar or whiter are bunched up together. I don't know your history so it's hard to judge. This is the same for the pleural thickening. If with calcification would be worrisome for asbestos exposure. Atelectases are smaller airways that are not fully open and aerated from many causes including poor inspiration.
Answered 12/1/2013
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