ISSN 2564-7784 | E-ISSN 2564-7040
Original Article
Anatomical and Clinical Relevance of the Thyroid Foramen
1 Department of Anatomy, University of Health Sciences, Gülhane School of Medicine, Ankara, Turkey  
2 Division of Pediatric Neurosurgery, Children’s Hospital of Alabama, Birmingham, AL, USA  
Eur J Ther 2018; 24: 168-172
DOI: 10.5152/EurJTher.2018.487
Key Words: Thyroid cartilage, thyroid foramen, superior laryngeal nerve
Abstract

Objective: The thyroid foramen (TF) is an opening on the lamina of the thyroid cartilage. It may be located on the posterosuperior part of the lamina or below the superior tubercle. The aim of the present study was to determine the incidence of the foramen in an adult Turkish population and the morphometry, topography, and structures within it, thereby aiding surgeons working in this area.


Methods
: In 57 formalin-fixed cadaveric laryngeal specimens, 113 (56 right and 57 left) sides were dissected using a surgical microscope.


Results
: The TF was observed in 6 out of 57 (10.5%) specimens. It was bilateral in 3 (5.3%) specimens; thus, it was observed in 9 sides. It was located at (33.3%) or posterior to (66.7%) the oblique line and below the superior tubercle. It was crossed by only a nerve in 2 (22.2%) left sides, an artery with a vein in 2 (22.2%) sides, or a neurovascular bundle in 5 (55.6%) sides.


Conclusion
: The TF is a variation located on the lamina of the thyroid cartilage with an incidence of 2% to 57% in adults. Neurovascular structures can pass through it. It is important in two aspects: surgical exposure and spread of laryngeal tumors.

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