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Images of the lung that show a histological pattern of usual interstitial pneumonia, with subpleural fibrosis and scattered fibroblastic foci (black arrows) (A). Pulmonary parenchyma demonstrates karyomegalic cells (white arrows) within the alveolar epithelium (B), alveolar (C) and perivascular (D) interstitium. (A) Original magnification x40, (B–D) x200. Hematoxylin & Eosin stain.
