FIG 1. 16-year-old boy with a purely cystic thyroid nodule (group A).

A, Ultrasonogram obtained before ethanol sclerotherapy shows a huge hemorrhagic thyroid nodule.

B, Ultrasonogram obtained 2 months after ethanol sclerotherapy reveals the complete disappearance of the cystic portion of the thyroid nodule and replacement by echogenic material.

C, Ultrasonogram obtained 9 months after ethanol sclerotherapy shows a decrease in the size of the postsclerotic thyroid nodule.