Preschooler with a midline neck mass

I-123 scan of thyroglossal duct cyst containing thyroid tissue
Anterior view of a I-123 thyroid scan shows tracer uptake in a single midline region that corresponds directly to the patient’s midline neck mass, without any demarcation of the lobes of the thyroid. There was no other thyroid uptake in the neck.

The diagnosis was thyroglossal duct cyst containing thyroid gland tissue.