Abstract
The occurrence of carcinoma of thyroid tissue at the base of the tongue is so rare as to justify reporting this case. If one accepts the statement of Gruber (1) that the incidence of aberrant thyroid tissue in routine post-mortem examinations is over 10 per cent, the number of reported neoplasms occurring in this tissue seems disproportionately small when compared with the frequency of tumor formation in the normally placed thyroid. Cattell (2) states that the term “aberrant thyroid” includes all portions of thyroid tissue in other than the normal position of the thyroid gland and unconnected with it. He classifies these as follows: (1) lingual thyroid and thyroid tissue found along the thyroglossal tract; (2) lateral aberrant thyroids or those in a cervical position lateral to the jugular vein; (3) the extremely rare intrathoracic goiter having no connection with the main thyroid body; (4) those portions of thyroid tissue found in teratoid tumors and sites far removed from the thyroid.
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