Bronchiolitis and bronchiolectasis are nonspecific inflammatory processes of the small airways caused by many different conditions. Because visibility on HRCT is limited to bronchi more than 2 mm in diameter, normal lobular bronchioles cannot be seen on HRCT. However, diseased bronchioles can be visualized. Direct CT findings of bronchiolar disease include bronchiolar wall thickening, bronchiolar dilatation, and luminal impaction (Fig. 17). Bronchio-lar luminal impaction with secretions or fibrotic material manifests as 2- to
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