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**Usually peripheral predominant (~60% of cases) and lower lobe predominant (~70-75% of cases). | **Usually peripheral predominant (~60% of cases) and lower lobe predominant (~70-75% of cases). | ||
**Typically all lobes are involved - though upper lobe spared in ~20% of cases. | **Typically all lobes are involved - though upper lobe spared in ~20% of cases. | ||
*Fibrotic (radiologic) changes ~50% of cases. | |||
==Microscopic== | ==Microscopic== |
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