Pyramidal lobe of thyroid
Updates to Article Attributes
The pyramidal lobe of thyroid (a.k.a.(also known as Lalouette pyramid 5) is a normal anatomic variant representing a superior sliver of thyroid tissue arising from the thyroid isthmus. 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.
A band of fibrous tissue may be present extending superiorly from the pyramidal lobe to the hyoid bone, sometimes with a skeletal muscle component, termed the levator glandulae thyroideae muscle 4.
-<p>The <strong>pyramidal lobe of thyroid</strong> (a.k.a. <strong>Lalouette pyramid</strong> <sup>5</sup>) is a <a href="/articles/normal-anatomic-variants">normal anatomic variant</a> representing a superior sliver of thyroid tissue arising from the thyroid isthmus. It is seen as a third <a href="/articles/thyroid-gland">thyroid</a> lobe and is present in 10-30% of the population.</p><p>It represents a persistent remnant of the <a href="/articles/thyroglossal-duct">thyroglossal duct</a>. 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 <sup>3</sup>. </p><p>It is not uncommon to see it on routine thyroid ultrasound, a study of 416 patients in 2014 found it in 21% <sup>3</sup>.</p><p>All the pathologies that may be seen in the normal thyroid are also seen in the pyramidal lobe.</p><p>A band of fibrous tissue may be present extending superiorly from the pyramidal lobe to the hyoid bone, sometimes with a skeletal muscle component, termed the <a href="/articles/levator-glandulae-thyroideae-muscle">levator glandulae thyroideae muscle</a> <sup>4</sup>.</p>- +<p>The <strong>pyramidal lobe of thyroid</strong> (also known as <strong>Lalouette pyramid</strong> <sup>5</sup>) is a <a href="/articles/normal-anatomic-variants">normal anatomic variant</a> representing a superior sliver of thyroid tissue arising from the thyroid isthmus. It is seen as a third <a href="/articles/thyroid-gland">thyroid</a> lobe and is present in 10-30% of the population.</p><p>It represents a persistent remnant of the <a href="/articles/thyroglossal-duct">thyroglossal duct</a>. 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 <sup>3</sup>. </p><p>It is not uncommon to see it on routine thyroid ultrasound, a study of 416 patients in 2014 found it in 21% <sup>3</sup>.</p><p>All the pathologies that may be seen in the normal thyroid are also seen in the pyramidal lobe.</p><p>A band of fibrous tissue may be present extending superiorly from the pyramidal lobe to the hyoid bone, sometimes with a skeletal muscle component, termed the <a href="/articles/levator-glandulae-thyroideae-muscle">levator glandulae thyroideae muscle</a> <sup>4</sup>.</p>
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