Usefulness of Laryngeal Phonation CT in the Diagnosis of Vocal Cord Paralysis
Bum Soo Kim1,
Kook Jin Ahn2,
Young Hak Park3 and
Seong Tai Hahn2
1 Department of Radiology, Kangnam St. Mary's Hospital, College of Medicine, The
Catholic University of Korea, Seoul, South Korea.
2 Department of Radiology, St. Mary's Hospital, College of Medicine, The
Catholic University of Korea, 62, Yeouido-dong, Youngdeungpo-gu, Seoul,
150-713, South Korea.
3 Department of Otolaryngology, St. Mary's Hospital, College of Medicine, The
Catholic University of Korea, Seoul, South Korea.
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Fig. 1A —37-year-old woman with left vocal cord paralysis. Coronal
reconstructed image shows distance between cord tip and midline of laryngeal
airway during phonation. Straight line is drawn along middle of laryngeal
airway, and distances (gray arrows a and b) between each vocal cord
and midline of laryngeal airway are measured. Black arrows indicate stretched
vocal cord during phonation.
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Fig. 1B —37-year-old woman with left vocal cord paralysis. Coronal
reconstructed image shows measurement of vocal cord angle formation during
phonation. Median line is drawn between superior and inferior marginal lines
of vocal cord and is used as vocal cord axis. Angles (a and b) between vocal
cord axis and midline of laryngeal airway are measured and used as measure of
vocal cord angle formation.
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Fig. 2A —29-year-old woman in good health. Coronal reconstructed CT
image of larynx during normal breathing shows larynx at level of vocal cords
appears to be flat, without vocal cord protrusion.
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Fig. 2B —29-year-old woman in good health. Coronal reconstructed CT
image of larynx during phonation of /hee/ shows both vocal cords stretched
across opening of larynx, forming acute angle with midline known as shoulder
formation (arrows).
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Fig. 3A —49-year-old man with right vocal cord paralysis for 4 months.
Coronal reconstructed CT image of larynx during normal breathing shows relaxed
appearance of unaffected left vocal cord in contrast to protruding appearance
of affected right vocal cord (arrow).
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Fig. 3B —49-year-old man with right vocal cord paralysis for 4 months.
Coronal reconstructed image during phonation of /hee/ shows unaffected left
vocal cord has definite protrusion to midline of laryngeal airway
(arrow). No definite change is evident at affected right vocal
cord.
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Fig. 4A —65-year-old woman with left vocal cord paralysis for 2 years.
Coronal reconstructed CT image of larynx during normal breathing shows relaxed
appearance of both vocal cords without protrusion (arrows).
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Fig. 4B —65-year-old woman with left vocal cord paralysis for 2 years.
Coronal reconstructed image during phonation of /hee/ shows unaffected right
vocal cord protruding to midline of laryngeal airway with definite shoulder
formation (black arrow). Affected left vocal cord (white
arrow) has relaxed, obtuse appearance.
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Copyright © 2008 by the American Roentgen Ray Society.
