PMC9052978_01
High magnification of an interlobular septum showing occlusion of a vein. H&E stain with 200x magnification
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Biopsy findings were significant for capillary proliferation, marked intimal and medial thickening of the pulmonary arterioles, sclerosis of pulmonary veins with focal occlusion associated with dilated lymphatics (Figure 1).
Movat stain section showing an interlobular septum with a pulmonary vein showing thickening of the wall with marked fibrous proliferation
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Special stain with movat pentachrome showed intra-alveolar hemosiderin and septal thickening with collagen deposition associated with veno-occlusive changes in pulmonary veins with sclerosis and fibrosis, together with capillary proliferation and arterial changes (Figure 2).