Lingual thyroid. Case report and review of the literature.

We review the world literature on lingual thyroid. One of our cases of lingual thyroid is added to this body of information specifically because of the patient's unusual lack of any response to hormonal suppression treatment. This behavior was suggestive of a malignant neoplasm and was, in our opinion, indication for excisional biopsy, even without any of the usual symptoms associated with lingual thyroid. To our knowledge, this behavior has not been previously reported.