Table 1 Inclusion and exclusion criteria

Inclusion criteria

1. Routine US with complete images and clear quality, and the US image is typical benign, the pathological result of fine needle aspiration cytology is benign, and the BRAF gene test result of puncture fluid is also negative

2. Patients did not receive chemoradiotherapy or other cancer treatment prior to ablation

Exclusion criteria

1. Pathology results that cannot be identified as benign

2. Unclear images with incomplete nodules

3. Pregnant and lactating women

4. Patients with a severe allergic history or severe cardiopulmonary disease