A) Pulmonary veno-occlusive disease (PVOD) with partial thrombotic occlusion of the lumen of a medium-sized vein (haematoxylin and eosin stain, 200× original.

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a) Pulmonary veno-occlusive disease (PVOD) with partial thrombotic occlusion of the lumen of a medium-sized vein (haematoxylin and eosin stain, 200× original magnification). b) An area simulating a capillary haemangiomatosis in a patient with PVOD, showing ... a) Pulmonary veno-occlusive disease (PVOD) with partial thrombotic occlusion of the lumen of a medium-sized vein (haematoxylin and eosin stain, 200× original magnification). b) An area simulating a capillary haemangiomatosis in a patient with PVOD, showing capillary proliferation with interstitial thickening and hemosiderin deposits (haematoxylin and eosin stain, 200× original magnification). c) Thrombotic occlusion of medium-sized veins (Weigert's elastic stain 100×). d) Almost complete thrombotic occlusion of the lumen of a small vein (haematoxylin and eosin stain, 200× original magnification). Figure courtesy of Dr. A. Cavazza (Unit of Pathology, IRCCS-Arcispedale S. Maria Nuova di Reggio Emilia, Reggio Emilia, Italy). Yochai Adir et al. Eur Respir Rev 2015;24:400-410 ©2015 by European Respiratory Society