In its broadest sense the term "aberrant thyroid" includes all portions of thyroid tissue in other than the normal position of the thyroid gland and unconnected with it. This includes (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 with no connection with the main thyroid body and, finally, (4) those portions of thyroid tissue found in teratoid tumors and in sites far removed from the thyroid. The fact that certain portions of the thyroid extend into intrathoracic, substernal, subclavicular, retrotracheal and retrolaryngeal positions does not make them aberrant in any sense. True intrathoracic goiters with no connection with the inferior pole of the thyroid are rarely found and it is quite likely that these have previously been a part of the gland but have become separated
CATTELL RB. ABERRANT THYROID. JAMA. 1931;97(24):1761–1767. doi:10.1001/jama.1931.02730240011003
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