14 cases were transglottic carcinoma showing extension of mass across ventriculus larynges, narrowing cavity anterior to throat, and damaging cricoid cartilage and spooncartilage.
BACKGROUND: Various investigative tools, including direct visualization with stroboscopy and indirect observation with glottography, have been widely used for the observation of vocal fold vibration.
Methods Video-stroboscopy was used to reveal the laryngeal cavity and dynamic changes of the vocal fold, and sound spectrograph was used to examine audio frequency, pitch and width.