thyroglossal cyst is a lump or mass in the neck that is filled with fluid. During pregnancy, the fetal thyroid gland begins to form at the base of the tongue and moves to the neck below the thyroid cartilage. The cyst forms when part of the thyroglossal duct does not disappear and remains after birth, resulting in the formation of a thyroglossal cyst.

Thyroglossal cyst is the most common congenital malformation of the mid-neck region, related to the existence of the thyroglossal duct. During the formation of the thyroid gland, if the thyroglossal duct does not disappear and persists after birth, it will cause thyroglossal cyst.

Thyroglossal duct cyst is a congenital anomaly caused by an embryonic abnormality during thyroid gland formation. This anomaly affects approximately 7% of the population and can occur at any age, especially in children.