• Patchy areas of chronic interstitial inflammation(lymphocyte infiltration) and ☆interstitial fibrosis intermixed with normal lung
• Early lesions consist of fibroblastic foci that become increasingly collagenous with time
• Honeycomb pattern with fibrotic walls and cystic spaces lined by bronchiolar epithelium
• Fibrosis most prominent in the ☆subpleural and perilobular regions
respiratory
UWorld
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