Clinical Correlates
Thyroid Factor
Thyroglossal Duct and Thyroid Abnormalities
A thyroglossal cyst may lie at any point along the migratory pathway of the thyroid gland but is always near or in the midline of the neck. As indicated by its name, it is a cystic remnant of the thyroglossal duct, Although approximately 50% of these cysts are close to or just inferior to the body of the hyoid bone (Figs. 15.19 and 15.20), they may also be found at the base of the tongue or close to the thyroid cartilage. Sometimes a thyroglossal cyst is connected to the outside by a fistulous canal, a thyroglossal fistula. Such a fistula usually arises secondarily after rupture of a cyst but may be present at birth.
Figure 15.18 A. The thyroid primordium arises as an epithelial diverticulum in the midline of the pharynx immediately caudal to the tuberculum impar. B. Position of the thyroid gland in the adult. Broken line, the path of migration.
Figure 15.18 A. The thyroid primordium arises as an epithelial diverticulum in the midline of the pharynx immediately caudal to the tuberculum impar. B. Position of the thyroid gland in the adult. Broken line, the path of migration.
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