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Video-assisted thoracoscopic lung biopsy photomicrographs (Hematoxylin Eosin staining). (A) Alveolar walls are thickened with diffuse interstitial fibrosis (original magnification ×12). (B) Interstitial fibrosis with characteristic temporal monogeneity is present with associated chronic interstitial inflammation, whereas fibroblastic foci are not seen (original magnification ×100).
