Thyroglossal cysts are congenital cysts that form in the neck when the thyroglossal duct degenerates incompletely and does not disappear during early embryonic thyroid development. The occurrence of thyroglossal cysts is not significantly related to gender, and can occur in both men and women. They can occur at any age, but are more common in adolescents under 30 years of age. The cysts may occur anywhere between the blind foramen of the tongue in the middle of the front of the neck and the sternal notch, most commonly above and below the body of the hyoid bone, and sometimes to one side. Clinical features of thyroglossal cysts: ① Most common in children aged 1-10 years old, also seen in adults, cysts grow slowly. The cysts grow slowly. ② They occur in the midline of the neck and are round. Soft. It is round, soft and smooth. The circumference is clear, and it is most common above and below the hyoid bone. In cysts located below the hyoid bone, the cords can be detected and adhered to the hyoid bone. The cyst may move up and down with swallowing. ⑤ Puncture may draw out clear or cloudy yellow thin or viscous fluid.