First examination (TSH 0 U/mL, FT4 57.3 pM/L)

6 weeks later (TSH 0 mIU/L, FT4 17.6 pM/L)

6 months later (TSH 0 mIU/L, FT4 41.4 pM/L)

 

In those cases where the basic hypoechogenic structure does not change over time, the relapse of hyperthyroidism is more likely than in those where the hypoechogenicity gradually decreases.