Pulmonary Vein Stenosis Mimicking Nonspecific Interstitial Pneumonia

Figure 2

Lung biopsy from the patient with pulmonary vein stenosis. (a) Low magnification shows thickening of the interlobular septa (hematoxylin and eosin stain, original magnification ×4). (b) High magnification exhibits nonspecific alveolar septal thickening (hematoxylin and eosin stain, original magnification ×40). (c) Prussian blue stain reveals intra-alveolar hemosiderin-filled macrophages (original magnification ×20). (d) Verhoeff-Van Gieson stain highlights medial hypertrophy and intimal proliferation in a muscular pulmonary artery (original magnification ×20).

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