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Ectopic thyroid tissue with normally located thyroid gland

In this article, we wanted to share a rare case with you. Ectopic thyroid tissue, which is a developmental anomaly of thyroid development, is usually a rare asymptomatic congenital anomaly. The embryological development of the thyroid gland begins as an epithelial proliferation at the foramen caecum, located medially at the junction of the anterior two-thirds and posterior one-third of the tongue, at approximately Day 24 of fetal life (1,2). Thyroid tissue develops in embryonal life and then descending towards its normal anatomic location moving anterior to the larynx and hyoid bone (and sometimes posteriorly) and finally to the front of the trachea. A number of anomalies may occur during this migration and during the development of the thyroid gland.