The lesion has a thin enhancing rim. Laryngocele develops as a consequence of chronically increased intraglottic pressure as may be seen in musicians, glass blowers, or excessive coughing. The lesions represent a dilated appendix of the laryngeal ventricle. Laryngoceles are classified as internal, external, or mixed, according to their relation to the thyrohyoid membrane.
Mixed types are the most common.
The internal type, as in this case, may cause stridor. Laryngoceles that develop without a known predisposing factor should raise the suspicion of an underlying neoplasm obstructing the laryngeal ventricle.