Depends: Could refer to an old fibrotic scar, a localized area of partial lung non-aeration (discoid atelectasis), thickened septum between the lobes of the lung, and others. Can't really say more without seeing the film. It almost always is an incidental finding.
Answered 8/31/2013
4.9k views
Usually benign: if linear density then usually means scar or atelectais (loss of volume).
Answered 11/21/2014
3.5k views
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