case_images: PMC9751489_01
case_images: US-guided RFA for left cervical mass.
case_images: fonc-12-987484-g001.jpg
case_images: PMC9751489_01_fonc-12-987484-g001.jpg
case_images: f1
case_images: Accordingly, we aspirated the liquid components in the lesion, considering the continuous new production of fluid, seed implantation was not carried out, but RFA inactivation was performed on the solid portion at the same time as fluid extraction ( Figure 1 ).
case_images: No contrast enhancement in left cervical mass according to postoperative ultrasonography.
case_images: fonc-12-987484-g002.jpg
case_images: PMC9751489_01_fonc-12-987484-g002.jpg
case_images: f2
case_images: Postoperative ultrasonography showed no obvious contrast enhancement in the metastatic lymph nodes of the left neck ( Figure 2 ).
case_images: Metastatic lymph nodes accompanying internal liquefactive necrosis in right neck as shown in ultrasonography.
case_images: fonc-12-987484-g003.jpg
case_images: PMC9751489_01_fonc-12-987484-g003.jpg
case_images: f3
case_images: The US-guided measurements showed one of the lymph nodes in the right neck was around 21 x 11 mm, another was around 24 x 17 mm ( Figures 3 ,  4 ), and there were heterogeneous internal echoes.
case_images: Right cervical lymph node metastasis.
case_images: fonc-12-987484-g004.jpg
case_images: PMC9751489_01_fonc-12-987484-g004.jpg
case_images: f4
case_images: The US-guided measurements showed one of the lymph nodes in the right neck was around 21 x 11 mm, another was around 24 x 17 mm ( Figures 3 ,  4 ), and there were heterogeneous internal echoes.