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Cytopathology specimen obtained by fine-needle aspiration. May-Grünwald-Giemsa-stained direct spread preparations show cohesive, papillaroid groups of cells with round to ovoid nuclei, inconspicuous nucleoli and abundant granular cytoplasm ((A) ×20 magnification and (B) ×40 magnification). On immunohistochemistry, the cells are negative for calcitonin ((C) ×40 magnification) and show patchy positivity for chromogranin A ((D) ×40 magnification).
