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Uptodate Reference Title
Alveolar microlithiasis
Alveolar microlithiasis
Chest radiograph shows multiple calcified micronodules due to small intraalveolar calcospherites. A dark rind of noninvolved lung separates the pleura from the involved parenchyma and is called the "black pleura sign." It is actually caused by paraseptal emphysema. The cardiac silhouette is darker than the confluent calcified lung opacities.