Key clinical message: This rare diagnosis highlights the importance of anatomical and embryological knowledge in the differential diagnosis of neck masses.
Abstract: A 41-year-old woman was referred to the head and neck surgery department because of a large midline neck mass at the level of the hyoid bone that was diagnostic for functioning thyroid tissue in a totally ectopic location.
Keywords: ectopic thyroid gland; neck mass; thyroid cancer; thyroid gland.
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