J Korean Radiol Soc.  1998 Sep;39(3):485-488. 10.3348/jkrs.1998.39.3.485.

The Normal Width of the Anterior Commissure of the True Vocal Cord in Korean Adults Measured by Helical CT

• Lim WY
• Lim DH
• Moon JI
• Ko YS
• Byeon JN
• Oh JH

• KMID: 2201271
• DOI: http://doi.org/10.3348/jkrs.1998.39.3.485

Abstract

PURPOSE: To evaluate the mean width of anterior commissure of true vocal cord in Korean adults by measuringits dimension on spiral CT scans.
MATERIALS AND METHODS
We reviewed the CT scans of 53 Korean adults(age range,23-73years; mean age 39.2years; M:F=41:12) without laryngeal disorders. Spiral CT scanning was performed aroundthe anterior commissure with 1mm slice thickness and table incrementation for 15 seconds. The anteroposteriorwidth of the anterior commissure was measured on CT scan where the true vocal cord and arytenoid, cricoid andthyroid cartilages were all present. We determined the mean width of the anterior commissure and whether there wasa relationship between age and the width of the anterior commissure.
RESULTS
The width of the anteriorcommissure was between 0.9mm and 2.3mm ; mean width was 1.60+/-0.38mm(mean+/-SD). Using two SDs above the mean wouldhave defined 2.36mm as the upper limit of normal width. Statistically, no significant correlation existed betweenthe age and the width of the anterior commissure(p>0.05).
CONCLUSION
An awareuess of the normal width range ofthe anterior commissure in Korean adults evaluated by spiral CT enhances the possibility of early detection ofinvasion of the anterior commissure by glottic cancer.

Keyword

Larynx, CT

MeSH Terms

Adult*
Cartilage
Humans
Tomography, Spiral Computed*
Tomography, X-Ray Computed
Vocal Cords*