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Histological images of tissue samples obtained by transbronchial lung biopsy. Atypical cells in sub‐epithelial tissue of bronchus and fibrosis in the alveolar wall (haematoxylin and eosin staining, 200×) (A). Immunohistochemical staining showing positivity for thyroid transcription factor‐1 (TTF‐1) (B) and napsin A (C).
