[A girl with a tumor at the base of the tongue]. / Een meisje met een zwelling op de tongbasis.

An 8-year-old girl with a lingual thyroid was evaluated because of a tumor at the base of the tongue. Ultrasound showed a hypoechogenic homogeneous parenchymatous structure at the base of the tongue consistent with thyroid tissue. Suboptimal levothyroxine treatment resulted in longstanding TSH stimulation causing a lingual goiter.