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Histological evaluation of the endoscopic ultrasound-guided fine-needle aspiration specimen. a Hematoxylin and eosin staining with low-power (scale bar: 200 µm) and b high-power (scale bar: 100 µm) magnifications revealed a dense, monotonous proliferation of atypical lymphocytes. Immunohistochemistry was positive for c CD20, d BCL2, e BCL6, and f CD10 (scale bars: 100 µm)
