The most frequently used methods for PTMC TA are radiofrequency ablation (RFA), microwave ablation (MWA), and laser ablation (LA) [8][9][10][11]. TA has the advantage of avoiding incisions, taking shorter operative time and reducing the length of stay of inpatients compared with thyroidectomy [12][13][14]. RFA introduces electrodes into the lesion area, which use an alternating current to generate local thermal energy with a frequency ranging between 200 and 1200 kHz, resulting in tissue necrosis and tissue degeneration due to a high local temperature [15]. RFA is terminated when the area of the nodule becomes hyperechoic on ultrasound or when the impedance increases, or a combination of the two [15]. The 2017 Korean RFA guidelines present the potential therapeutic role of RFA in PTMC patients who refuse or are ineligible for surgery [3].RFA has been shown to be an effective treatment method for PTMC far from the thyroid capsule.