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The Carotid-Hyoid Topography Is Variable.

Mihaela Daniela Manta1, Mugurel Constantin Rusu2, Sorin Hostiuc3

  • 1Department of Anatomy and Embriology, Faculty of Medicine, Victor BabeČ™ University of Medicine and Pharmacy, 300041 TimiČ™oara, Romania.

Medicina (Kaunas, Lithuania)
|August 26, 2023
PubMed
Summary
This summary is machine-generated.

Anatomical variations in the carotid-hyoid relationship are common, with many cases showing no direct contact. These variations, documented via CT angiograms, are crucial for understanding potential impacts on cerebral circulation.

Keywords:
carotid arterycarotid bifurcationcomputed tomographylarynxpharynx

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Area of Science:

  • Anatomy
  • Radiology
  • Vascular Surgery

Background:

  • Textbook anatomy typically depicts a unique carotid bifurcation location.
  • Previous case reports suggest variations in carotid artery positioning relative to the hyoid bone.
  • Specific anatomical possibilities and prevalences of these variations remain underexplored.

Purpose of the Study:

  • To investigate and classify the various anatomical relationships between the carotid arteries and the hyoid bone.
  • To determine the prevalence of different carotid-hyoid positional types.
  • To assess the bilateral symmetry and associations of these anatomical variants.

Main Methods:

  • Retrospective analysis of 147 CT angiograms.
  • Classification of 12 distinct types of carotid-hyoid relationships.
  • Evaluation of bilateral combinations and symmetry of identified types.

Main Results:

  • No carotid-hyoid relationship was observed in 168 out of 294 sides analyzed.
  • Variations included external carotid artery (ECA), internal carotid artery (ICA), common carotid artery (CCA), and carotid bifurcation (CB) positioned medial or lateral to the greater horn of the hyoid bone (GHHB).
  • Prevalence rates for specific types ranged from 0.34% to 20.41%, with Type VI (ECA lateral to GHHB) being the most frequent. Bilateral symmetry was observed in 70.74% of cases, with significant left-right associations.

Conclusions:

  • Mechanical compression of the hyoid bone on carotid arteries can negatively affect internal carotid artery (ICA) and cerebral circulation.
  • Variational anatomical patterns of carotid-hyoid relationships are common and can be accurately visualized using CT angiograms.
  • Individual anatomical assessment is recommended over relying solely on generalized textbook descriptions of carotid anatomy.