A<unk>  is a fibrous cyst that forms from a persistent<unk>  duct.<unk> s can be defined as an irregular neck mass or a lump which develops from cells and tissues left over after the formation of the thyroid gland during developmental stages.<unk> s are the most common cause of midline neck masses and are generally located caudal to (below) the hyoid bone. These neck masses can occur anywhere along the path of the<unk>  duct, from the base of the tongue to the suprasternal notch. Other common causes of midline neck masses include lymphadenopathy, dermoid cysts, and various odontogenic anomalies.<unk> s develop at birth. Many diagnostic procedures may be used to establish the degree of the cyst.
Thyroglossal cyst
Laryngeal cyst
Paradental cyst
Median mandibular cyst
Branchial cleft cyst
Colloid cyst
Vocal cord cyst
Gingival cyst