Fig. 1

(case 4) Morphological characteristics of PTC (H&E, 100x): (A) PTC exhibiting follicular and papillary structures, psammoma bodies (arrow), ground-glass nuclei, intranuclear pseudo inclusion bodies, and nuclear grooves; (B) Weak BCL-2 expression in PTC, in contrast to relatively strong expression in normal tissues; (C) Strong Cyclin D1 expression in PTC, with low expression in normal tissues.