Thyroglossal cyst is a congenital abnormality commonly found in the neck - a manifestation of the existence of the thyroglossal duct due to its failure to atrophy after birth. Thyroglossal cyst is caused by an embryonic abnormality during the formation of the thyroid gland. This abnormality accounts for about 7% of the population and can occur at any age.

Thyroglossal cyst is a congenital disease with the highest frequency among cervical cysts. If the disease is not treated promptly by surgery, it can cause many complications, the most important of which is the complication of infected thyroglossal cyst.