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(A) Gross image of lung biopsy. (B) Histological section of lung tissue depicting diffuse adenocarcinoma, ×40 (stain; H&E). (C) Histological section depicting diffuse lymphangitic involvement, ×40 (H&E). (D) Napsin A staining of lung tissue, ×400. (E) TTF-1 staining of lung tissue, ×400. (F) Thyroglobulin staining of lung tissue, ×400. TTF-1, thyroid transcription factor 1.
