Fig. 2. RFA example for PTMC.

A. Proven hypoechoic PTMC is located on right side of isthmus with spiculated margin. B. Lidocaine for local anesthesia at puncture site and around thyroid capsule was injected (thin arrows), and hydro dissection technique was performed due to tumor being located close to trachea (thick arrows). C. This was followed by ablation with thyroid-dedicated electrode. D. Echogenicity changed in ablated zone, displaying large ablation zone, including primary cancer and surrounding normal thyroid tissue.