Case Report

Pleuroparenchymal Fibroelastosis: A New Entity within the Spectrum of Rare Idiopathic Interstitial Pneumonias

Figure 4

Case  1. (a) Microscopic examination of explanted lung of Case  1 (right upper lobe). The increase of elastic fibers and abrupt transition to normal parenchyma is evident. HE 200x. (b) The involved areas show collapse of alveolar spaces by interstitial material that corresponds to elastic fibers. Scant lymphocyte infiltrate. HE 400x. (c) Van Gieson stain demonstrates abnormal elastic fibers in the thickened interstitium.