Thyroglossal duct cysts (TDC) are the most common cervical cysts and are usually considered to be a benign embryonic malformation where the thyroglossal duct fails to obliterate.

• 摘要甲状舌骨囊肿是最常见的颈部囊肿，一般认为是胚胎发育过程中，甲状舌管没有关闭造成的良性胚胎畸型；