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lingual thyroid
Decent of thyroid gives rise to thyroglossal duct.
Remnants of thyroid persisting along this tract include:
1) lingual thyroid
2) thyroglossal cyst or nodule
3) pyramidal lobe of thyroid, a structure contiguous with the thyroid isthmus
The lingual thyroid may rarely be the only functioning thyroid tissue.
General
thyroid
References
Harrison's Principles of Internal Medicine, 13th ed.
Isselbacher et al (eds), McGraw-Hill Inc. NY,
1994, pg 1931