Chapter 19. ACUTE AND SUBACUTE, AND RIEDEL’S …

Ectopic thyroid development can result in a lingual thyroid or in thyroid tissue in a suprahyoid, infrahyoid, or intratracheal location. Persistence of the thyroglossal duct as a sinus tract or as a cyst (called a thyroglossal duct cyst) is the most common of the clinically important anomalies of thyroid development (Fig. 20). ................
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