KRAS mutation and MIR (miRNA classifier)-positive. (A,B) Cytology smears showed increased cellularity of follicular cells arranged in groups with nuclear crowding and overlapping, some loosely cohesive clusters, and microfollicles (cytology diagnosis of follicular neoplasm) (Papanicolaou stains, ×200). (C) A histologic evaluation showed PTC with foci of follicular architecture (H & E, ×40), and high power showed PTC nuclear features (H & E, ×400). PTC indicates papillary thyroid carcinoma.