[Ultrasound diagnosis of benign teratoma of the thyroid gland]

We report about a six-year old girl who underwent a hemithyroidectomy because of a teratoma in the right thyroid gland. In ultrasonography, the teratoma shows a rather well limited tumor in the right thyroid gland. It shows no signs of infiltration or compression of adjacent structures. The inner structure of the teratoma is characterized by an inhomogeneous and mixtured picture of high density echos, low density echos and areas without echos. Although the localisation of the tumor was possible by ultrasonography, the specific diagnosis of a teratoma remains difficult.