Fig. 1From: Efficacy and safety of radiofrequency ablation for benign thyroid nodules in patients with previous thyroid lobectomyThe 18-gauge bipolar RFA needle used in this study. The ultrasound image of the 18-gauge bipolar RFA needle (arrows) during the RFA procedure for benign thyroid nodules (a). The needle had insulated metallic sheath (arrowheads) and the active tip was 0.9Â cm (b)Back to article page