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. 2017 Jun 20;14:16. doi: 10.4103/cytojournal.cytojournal_50_16

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Copyright: © 2017 Rahman, et al.; Licensee Cytopathology Foundation Inc.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms.

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Metastatic pulmonary squamous cell carcinoma to thyroid. (a) Disordered tumor clusters with overlapping nuclei, nuclear pleomorphism, and high nuclear-cytoplasmic ratios on fine-needle aspiration (×400, Diff-Quik stain). (b) Spindled tumor cells with enlongated hyperchromatic nuclei and dense glassy cytoplasm on fine-needle aspiration (×1000, Diff-Quik stain). (c) Cell block showing metastatic squamous cell carcinoma (×400, H and E) immunopositive for cytokeratin 5/6 (d), p63 (e), and negative for thyroid transcription factor-1 (f) (×200)