Residual tumor and central lymph node metastasis after thermal ablation of papillary thyroid carcinoma: A case report and review of literature

Figure 1 Ultrasound and contrast-enhanced computed tomography images obtained 3 mo after radiofrequency ablation for papillary thyroid carcinoma. A: The left thyroid nodule (arrow) (6 mm × 8 mm × 12 mm) with hypoechogenicity, unclear margins, and scattered small calcifications on ultrasound was classified as Thyroid Imaging Reporting and Data System stage 4c. Metastatic central lymph nodes (arrowhead) were also detected; B: The right thyroid nodule (5 mm × 5 mm × 7 mm) with hypoechogenicity and unclear margins on ultrasound was classified as Thyroid Imaging Reporting and Data System stage 4a; C: Central lymph node metastasis was detected using contrast-enhanced computed tomography.