46-year-old woman with a cystic thyroid nodule (group B).
A, Ultrasonogram obtained before ethanol sclerotherapy shows a nearly pure thyroid cyst with an intracystic blood clot (arrow).
B, Ultrasonogram obtained after aspiration of infused ethanol shows the disappearance of the cystic portion and incomplete collapse of the cystic nodule due to the blood clot (arrow).
C, Ultrasonogram obtained 24 months after ethanol sclerotherapy shows the markedly decreased size of the thyroid nodule (arrow) without the cystic portion.