Fig. 1

Images of ¹²⁵I implantation in the treatment of a metastatic nodule on the left cervical level IV in an 83-year-old man who had previously undergone left lobe and isthmus excision and left neck dissection owing to papillary thyroid carcinoma. a Externally, the CMLN was superficial and, broad at the base, with high skin tension and bleeding apical ulcer (white arrows). b Conventional US image showing a hypoechoic CMLN with no lymphatic hilus was 38 mm × 37 mm × 34 mm in size and 25,017 mm³ in volume (white arrows). c During implantation, US monitoring showed that hyperechoic ¹²⁵I seeds were implanted into the lesion (white arrows). d Six months after implantation, the lesion had visibly shrunk (white arrows). e 12 months after implantation, US showed that the lesion was 23 mm × 17 mm × 11 mm in size and 2251 mm³ in volume with VRR = 91% (white arrows), ¹²⁵I seeds in the lesion (arrowheads). f Lesion had significantly shrunk and the apical ulcer had healed (white arrows)