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Pathological findings of the thoracoscopic lung biopsy. Diffuse infiltration and proliferation of medium to large, atypical lymphocytes were observed (hematoxylin and eosin; × 400 (A)). The tumor cells were positive for CD3 (B) and CD56 (C) by immunohistochemistry. Furthermore, in situ hybridization for Epstein-Barr virus (EBV)-encoded RNA (EBER) was positive (D).
