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Thyroid ectopy results from the failure of the thyroid precursor cells to migrate from the primordial pharynx to the anterior part of the neck. Most ectopic thyroids are revealed by congenital hypothyroidism and present as a single round mass at the base of the tongue, with no other thyroid tissue. However, some cases have dual ectopy, with part of the tissue having partially migrated. We hypothesized that this occurs more frequently than previously reported.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

A High Prevalence of Dual Thyroid Ectopy in Congenital Hypothyroidism: Evidence for Insufficient Signaling Gradients during Embryonic Thyroid Migration or for the Polyclonal Nature of the Thyroid Gland?