Thyroglossal Duct Cyst


The thyroid gland develops medially at the base of the
tongue and then descends anterior to the hyoid bone
along the thyroglossal duct to its normal position. When
the thyroglossal duct fails to obliterate, it results in the
formation of a median or paramedian cyst. The normal
thyroglossal duct extends from the foramen cecum at
the base of the tongue to the lower neck region where
the thyroid bed is. It is obliterated between the fi fth and
sixth weeks of gestation.
Thyroglossal duct cysts account for up to 70% of all
cystic malformations in the neck. Up to 50% are
located at the hyoid bone, 25% below the hyoid and
25% above it.

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