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. 2016 Mar 24;2016:6564094. doi: 10.1155/2016/6564094

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Copyright © 2016 Dearbhaile Catherine Collins et al.

This is an open access article distributed under 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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(a) Spindle and epithelioid malignant melanoma cells (arrowheads) admixed with background residual thyroid follicular cells (arrows). Papanicolaou stain, original magnification ×400. (b) TTF-1 highlights residual thyroid follicular cells and is negative in the lesional cells (arrows). TTF-1 ICC, original magnification ×200. (c) HMB45 and (d) MelanA ICC show strong positivity in the lesional cells. Original magnifications ×200. (e) S100 ICC weakly highlights the fine intracytoplasmic pigment present in the lesional cells (arrows). Original magnification ×100.