Fig. 3.

Examples of benign nodules (category II) in thyroid core needle biopsy. (A) The biopsy specimen shows follicular proliferative lesion without a distinct tumor capsule. (B) The high-power view of Fig. 3A shows benign-appearing follicular cells. This lesion can be interpreted as a benign follicular nodule. (C) The specimen is densely hyalinized and paucicellular. (D) The high-power view of Fig. 3C reveals benign-appearing follicular cells in the hyalinized stroma, suggesting a benign follicular nodule. (E) The specimen shows a Hürthle cell proliferative lesion. (F) The high-power view of Fig. 3E reveals Hürthle cell proliferation and lymphoid aggregates. This lesion should be interpreted as a benign Hürthle cell proliferative lesion rather than Hürthle cell neoplasm.