Fig. 7
From: Pulmonary veno-occlusive disease as a cause of severe pulmonary hypertension in a dog
Histologic appearance of the lungs demonstrating remodeling of pulmonary arterioles. a Normal pulmonary arteriole demonstrating a lamina elastica interna (arrow) and a lamina elastica externa (arrowhead). Weigert’s resorcine fuchsine. b Remodeled pulmonary arteriole with concentric intimal proliferation of fibrous tissue causing obliteration of the lumen (asterisk). Medial hypertrophy is also visible (triangle). Arrow indicates the lamina elastica interna, arrowhead indicates lamina elastica externa. Weigert’s resorcine fuchsine