1. a) Small pulmonary arteries within a fibrotic area (usual interstitial pneumonia lung).
a) Small pulmonary arteries within a fibrotic area (usual interstitial pneumonia lung). The narrowing of the vascular lumen is the result of both intimal fibrosis and medial smooth muscle increase. Haematoxylin–eosin–saffron staining. Scale bar=250 μm. b) Remodelled small pulmonary arteries outside fibrosis in usual interstitial pneumonia lung. Haematoxylin–eosin–saffron staining. Scale bar=200 μm.
Maria Rosa Ghigna et al. Eur Respir Rev 2017;26:170003
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