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thyroid pyramidal lobe; Lallouette pyramid; Morgagni appendix

An inconstant lobe of the thyroid gland that arises from the upper border of the isthmus & extends upward as far as the hyoid. 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.

General

thyroid

References

  1. Harrison's Principles of Internal Medicine, 13th ed. Isselbacher et al (eds), McGraw-Hill Inc. NY, 1994, pg 1931
  2. Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999

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