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. 2020 Jul 6;31(3):197–217. doi: 10.1007/s12022-020-09638-x

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© The Author(s) 2020

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Fig. 10 — Spindle cell variant of papillary thyroid carcinoma (PTC) showing spindle cells with typical PTC nuclei (a and b). Meningioma-like follicular adenoma (c and d), the typical arrangement of spindle to ovoid cells in a whorled pattern may give the impression one is dealing with a vascular tumor. Pericytic-like follicular adenoma (e) is characterized by a proliferation of spindle follicular cells concentrically arranged around vessels; the follicular nature of the tumor cells could be confirmed by the positivity for thyroglobulin (inset), thyroperoxidase, TTF1 and cytokeratins but negativity for calcitonin and CD31. PTC with fibromatosis/fasciitis-like stroma with both stromal and PTC component (f)