Abstract
Thyroglossal duct cysts usually arise from the remnants of the embryonic thyroglossal duct produced by the descendent of the thyroid anlage.The cysts occur mainly in the neck midline, but rarely in the oral cavity. We experienced an interesting case of thyroglossal duct cyst which was found in the sblingual area.The patient was a 6-month-old female infant. An elastic soft mass was palpable of which size was 1.5×1.0cm in the tongue. It was diagnosed clinically as a thyroglossal duct cyst based on the cystic contents and CT examination.In the treatment, we tried a radical excision of the cyst by Systrunk's procedure, which succeeded the remove the cystic mass, but failed to remove the hyoid bone.Histopathologically, the cyst was covered with columnar and stratified squamous epitheliums.Thyroid tissue was not found.The patient's postoperative course has been unremarkable for 7 months.
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