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A thyroglossal cyst is a fibrous cyst that forms from a persistent thyroglossal duct. Thyroglossal cysts can be defined as an irregular neck mass or a lump which had developed from cells and tissues left over after the formation of the thyroid gland during developmental stages.〔University of Rochester Medical Center. (2015). Thyroglossal duct cyst. Retrieved from http://www.urmc.rochester.edu〕 Thyroglossal cysts are the most common cause of midline neck masses and are generally located substandard to the hyoid bone, yet these neck masses can occur anywhere along the path of the thyroid gland from the base of the tongue to the suprasternal notch.〔Deaver, M. J., Silman, E. F., & Lotfipour, S. (2009). Infected thyroglossal duct cyst. Western Journal of Emergency Medicine. 10(3), 205. Retrieved from http://www.ncbi.nlm.nih.gov〕 Other common causes of midline neck masses include lymphadenopathy, dermoid cysts, and various odontogenic anomalies.〔 Thryoglossal cyst are developed at birth and can have many diagnosis procedures to establish the degree of the cyst. Also complications can come along with the before and after masses of the Thyroglossal Cysts, treatments are available to help with pain and reduction of the cyst. ==Presentation== It usually presents as a midline neck lump (in the region of the hyoid bone) that is usually painless, smooth and cystic, though if infected, pain can occur. There may be difficulty breathing, dysphagia (difficulty swallowing), or dyspepsia (discomfort in the upper abdomen), especially if the lump becomes large. The most common location for a thyroglossal cyst is midline or slightly off midline, between the isthmus of the thyroid and the hyoid bone or just above the hyoid bone. A thyroglossal cyst can develop anywhere along a thyroglossal duct, though cysts within the tongue or in the floor of the mouth are rare. A thyroglossal cyst will move upwards with protrusion of the tongue. Thyroglossal cysts are associated with an increased incidence of ectopic thyroid tissue. Occasionally, a lingual thyroid can be seen as a flattened strawberry-like lump at the base of the tongue.〔SRB's Manual of Surgery 3rd edition 2009;405;406.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thyroglossal cyst」の詳細全文を読む スポンサード リンク
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