Laryngocoele (Description: Congenital anomalous air sac communicating with cavity of larynx)
- Swelling appearing on Valsalva Maneuvre:
- The source of the content can be blood vessel (phlebectesia or abnormality of the jugular veins-appears as bluish swelling) or can be air from the airway (external laryngocoele).
- A soft cystic mass at the lateral side of the neck, which does not change with Valsalva manoeuver, includes pharyngeal pouch/pharyngocoele, branchial cyst, cystic hygroma or solid tumour.
- Thyroglossal Cyst appears as a midline swelling which moves on protrusion of tongue and swallowing
- Air filled cystic swelling due to dilation of saccule of the ventricle.
- The saccule is a diverticulum of mucous membrane which starts from the anterior part of ventricular cavity and extends upwards between vestibular folds and lamina of thyroid cartilage.
Laryngoceles can be classified into three types:
- Internal – A laryngocele is defined as internal if the dilatation lies within the limits of the thyroid cartilage.
- External – If the laryngocele extends beyond the thyroid cartilage and protrudes through the thyrohyoid membrane producing a lateral neck mass, it is considered external.
- External laryngocele presents as a reducible swelling in the neck which increases in size on coughing or performing valsalva
- Combined – In which both internal and external components are seen.
- Due to raised transglottic air pressure as in trumpet players, glass blowers or weight lifters.