Pediatric Teleradiology

History: 5 year old male with a midline neck mass.

Ultrasound of the midline neck in this 5 year old boy. What are the findings?
Ultrasound of the midline neck in this 5 year old boy. What are the findings?

What is your differential diagnosis for this pediatric patient with a midline neck mass? Comment and share below!

Note, doppler color images revealed no vascular flow within the mass.