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. 2010 Jun 14;7:9. doi: 10.4103/1742-6413.64385

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© 2010 Monaco et al; licensee Cytopathology Foundation Inc.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Pitfalls of a mucinous background. a) Squamous cell carcinoma showing clusters of cells with nuclear pleomorphism and dense cytoplasm in a background of mucinous material with histiocytes, inflammatory cells, and bronchial cells from bronchial contamination (DQ stain, ×200). b) Mucinous adenocarcinoma with tumor cells floating in a background of mucinous material without inflammatory cells or macrophages (DQ stain, ×400). c) Small cell carcinoma with a mucinous background (DQ stain, ×200). d) Nondiagnostic EBUS FNA with bronchial contamination (DQ stain, ×200)