Pyramidal lobe of thyroid

The pyramidal lobe of thyroid is a normal anatomic variant. It is seen as a third thyroid lobe and is present in 10-30% of the population.

It represents a persistent remnant of the thyroglossal duct. It usually arises from the right or left side of the isthmus extending in a cranial direction; pyramidal lobes arising directly from the midline of the isthmus were rare in a large ultrasound study, accounting for only 2% of the cases 3

It is not uncommon to see it on routine thyroid ultrasound, a study of 416 patients in 2014 found it in 21% 3.

All the pathologies that may be seen in the normal thyroid are also seen in the pyramidal lobe.

Anatomy: Head and neck
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Article information

rID: 36922
System: Head & Neck
Section: Anatomy
Tag: variant
Synonyms or Alternate Spellings:
  • Pyramidal lobe of the thyroid gland
  • Pyramidal lobe of the thyroid
  • Pyramidal lobe of thyroid gland

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Cases and figures

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    Figure 1: diagram
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    Case 1
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    Case 2: pyramidal lobe on ultrasound
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