Fig. 3.

Squamous nests, eddies as well as larger keratinized squamous pearls were identified centered abruptly within the monotonous round cells; black arrows highlight the squamous nests. Many of the keratinous pearls were calcified (A–D). Other features included colonization of thyroid follicles by tumor cells (E), pagetoid spread of tumor cells into the salivary ducts (F, G), entrapped ducts (H), and cracking artifacts separating large tumor nests (I)