Pyramidal lobe of thyroid

Zungengrundstruma
und Lobus pyramidalis in der Computertomografie. Links 3 axiale Schichten, rechts sagittal und schräg koronar.
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Thyroid
gland. Same as File:Thyroid.png, but legend adapted and coloured
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Lobus
pyramidalis und kleine Zungengrundstruma: Von den orthotop liegenden Schilddrüsenlappen zieht sich eine längliche Formation nach kranial bis unter das Zungenbein und eine weitere kleine, ebenfalls stark perfundierte Formation findet sich ventrokranial des Zungenbeins.
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Dual ectopy
thyroid - a case report. Well-defined infra-hyoid, pre-laryngeal neck swelling is hyperdense on plain CT (due to intrinsic Iodine content in thyroid tissue), showing 116HU.
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Dual ectopy
thyroid - a case report. Three well-defined hyperdense masses at sub-lingual level, anterior to oropharynx and infra-hyoid pre-laryngeal level; showing moderate contrast enhancement.
www.eurorad.org • CC by-nc-sa-4.0
Schilddrüse
mit ihrer Blutversorgung.
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Radiopaedia • CC-by-nc-sa 3.0 • de

The pyramidal lobe of thyroid (a.k.a. Lalouette pyramid ) 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 .

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

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 .

Siehe auch:
und weiter:
Assoziationen und Differentialdiagnosen zu Lobus pyramidalis:
Ductus
thyreoglossus
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