What are the imaging features of the cystic pattern of interstitial lung disease?
This pattern is characterized by a group of curved lines that produce a network of fine ring shadows in the more central lung. Although a reticular pattern, the cystic pattern is quite distinct from the peripheral reticular pattern. In the cystic pattern, the holes are, on average, approximately 10 mm in diameter, which are much larger than the holes seen in the peripheral reticular pattern. The rings of the cystic pattern are distributed in the more central lung, whereas the peripheral reticular pattern characteristically affects the subpleural and basilar lung (