Thyroglossal duct cysts (TDCs) are common congenital neck masses resulting from remnant epithelial tissue from the thyroglossal duct. The most common presentation is a painless anterior neck mass and infections of cysts or fistula. Most TDCs are located between the hyoid bone and thyroid gland. A Sistrunk operation in which the cyst is excised together with the body of the hyoid bone is the standard procedure for treatment of a TDC. Despite the close proximity of the TDC to laryngeal structures, only 11 cases have been reported to extend into the larynx. However, the patient reported here, at 1 month of age, is the youngest person reported with a TDC and intralaryngeal extension.
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