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Cytological examination. (a) Lymph node containing metastatic small cell carcinoma (Diff-Quick stain, ×400); (b) histological small cell pattern in a cell block section (H and E stain, ×250); (c) thyroid transcription factor-1 (TTF-1) immunohistochemical staining, nuclear positivity (×250); (d) Synaptophysin positivity, that confirms neuroendocrine differentiation (×250)
