Intra-thyroid thyroglossal duct cyst as a differential diagnosis of thyroid nodule.

An intra-thyroid thyroglossal duct cyst (ITTDC) presented as a congenital anterior neck mass in a 10-year-old male. Diagnosis, work-up, management approach, and differential diagnosis of thyroid nodules are discussed, as well as distinguishing features between thyroglossal duct cyst (TDC) and branchial cleft cyst (BCC). This is the fourth case of ITTDC reported in the pediatric population, and ITTDC should remain in the differential diagnosis of pediatric neck mass.