Compare the 2 series of pictures.

At the time of the discontinuation of methimazole therapy, the size of the thyroid, the echogenicity and the vascularization have normalized.

The persistence of hypoechogenicity and/or increased vascularization are predictors of relapse of hyperthyroidism. There is a very strong correlation between the TSH-receptor antibody test and the former sonographic features regarding their prognostic value.