PMC6459062_01
(a) The tumor composed of complex papillary structures in mature cystic teratoma (H and E, x100), (b) Thyroid papillary carcinoma showing grooves, nuclear pseudoinclusions, nuclear clearing (chromatin margination) (H and E, x400), (c) Chronic lymphoid thyroiditis with diffuse oncocytic changes in follicular epithelial cells (red arrow) and lymphoid follicles with germinal centers (black arrow) in the thyroid tissue (H and E, x200) , (d) Respiratory type epithelium, seromucous glandular structures, mature cartilage and keratinous material within mature cystic teratoma (H and E, x100)
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F1
Furthermore, a 1-cm diameter papillary microcarcinoma with nuclear features such as nuclear grooves, nuclear pseudoinclusions, and papillary structures with fibrovascular cores were observed in this background [Figure 1a and b]. Around the tumor, there were intense lymphoplasmacytic inflammatory cell infiltration, diffuse cystic degeneration, lymphoid follicles with prominent with germinal centers, and prominent oncocitic change (Hurthle cell) in follicular epithelial cells [Figure 1c]. Apart from thyroid tissue, cyst wall with skin with adnexal structures, cartilage tissue, respiratory type epithelium, seromucous glands, and hair shafts were observed [Figure 1d].