Fig. 2

a 47-year-old male with a PTMC lesion in whom conventional ultrasound examination showed a 7.8 mm × 6.8 mm × 4.3 mm hypoechoic nodule. b After PLA, CEUS revealed a hypoechoic area in the original area, along with some debris in the centre that presented as strong echoes, which demonstrated that the lesion had been completely ablated. c Six months after PLA, conventional ultrasound examination showed a 7.1 mm × 3.2 mm × 2.1 mm hyperechoic nodule. d Eighteen months after PLA, conventional ultrasound examination showed that the lesion had completely disappeared