Figure 1.

Intra procedural ultrasound during radiofrequency ablation in a 58-year-old male. Pre-ablation scan (a) demonstrates the target nodule with maximum dimension of 28 mm in the medial left lobe. After local anaesthetic injection to the skin and subcutaneous tissues, extending to the thyroid capsule, the ablation probe is inserted using the trans-isthmic approach in a medial to lateral direction (b) avoiding critical structures in the danger triangle – bottom left of image. Heating at the tip of the probe leads to tissue vaporisation and echogenic artefact. At the end of treatment (c) heterogeneous echogenic artefact is seen throughout the nodule.