Abstract
Human thyroid gland derives mainly from one median anlage, which develops from invagination in the floor of the primitive pharynx, at the base of the tongue. This anlage, during its maturation, migrates downward, along the transient thyroglossal duct anterior to the trachea, on an S-shaped path in relation to inferior margin of hyoid bone. During this descent, the connection between the thyroid gland and the floor of pharynx (foramen caecum) may persist to form a thyroglossal duct (TGD) [1]. Thyroglossal duct cysts occurs in 7% of the adult population [2]. However, carcinoma in TGD cyst is rare with reported incidence of less than 1% [3]. We describe a case of papillary carcinoma in a thyroglossal duct cyst.
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