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Thyroglossal Duct Cysts PictureA fluid-filled sac present at birth in the midline of the neck. A thyroglossal cyst is a congenital malformation (a birth defect). It results from incomplete closure of a segment of the thyroglossal duct, a tube-like structure that normally closes as the embryo develops. Also called a thyroglossal duct cyst. The picture below shows the bulge in the neck caused by a Thyroglossal Duct Cyst.
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