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The normal pediatric larynx on CT and MR
P A Hudgins1, J Siegel, I Jacobs
1Department of Radiology, Emory University School of Medicine, Atlanta, Ga 30322, USA.
AJNR. American Journal of Neuroradiology
|February 1, 1997
Summary
The pediatric larynx has distinct size, position, and shape compared to adults, as shown on CT and MR imaging. These imaging features are crucial for understanding normal pediatric airway anatomy.
Area of Science:
- Radiology
- Pediatric Imaging
- Anatomy
Background:
- Accurate imaging of the pediatric larynx is essential for diagnosing airway abnormalities.
- Understanding normal pediatric laryngeal anatomy on imaging differs from adult anatomy.
Purpose of the Study:
- To define the typical Magnetic Resonance (MR) and Computed Tomography (CT) imaging characteristics of the normal pediatric larynx.
- To establish reference standards for pediatric laryngeal imaging.
Main Methods:
- Retrospective review of 15 pediatric CT scans and 15 pediatric MR examinations of normal larynges.
- Analysis of laryngeal components, hyoid bone level, paraglottic fat, airway dimensions, and contours.
- Correlation of imaging findings with gross and histologic examination of cadaveric larynges.
Main Results:
- The pediatric larynx is positioned higher (hyoid bone at C2-3 in infants) and has a narrower subglottic airway compared to adults.
- Only the hyoid bone showed ossification; other cartilages appeared as featureless soft tissue on CT and MR.
- Distinct airway contours were observed: triangular/oval supraglottic, teardrop glottic, and oval subglottic.
Conclusions:
- The pediatric larynx exhibits significant differences in size, position, consistency, and shape compared to the adult larynx.
- These anatomical variations are accurately depicted on CT and MR imaging.
- This study provides foundational imaging data for the normal pediatric larynx.