Figure 3

Interface of pleuroparenchymal fibroelastosis with unaffected lung parenchyma. (a) Sharp demarcation between fibroelastotic area and adjacent unaffected lung tissue (hematoxylin and eosin stain, original magnification × 50); (b) Fibroblastic foci at interface (hematoxylin and eosin stain, original magnification × 100).