Laryngocoele
A laryngocoele refers to a dilatation of the laryngeal ventricular saccule 1-2.
Pathology
It is lined by pseudostratified, columnar, ciliated epithelium. Occasional areas of stratified squamous epithelium + / - submucosal serous and mucous glands maybe present.
Sub types
It may be internal (confined to larynx ~ 40% 2), external ( ~ 25%) or mixed (internal and external components ~ 45%). A mixed laryngocoele herniates through the thyrohyoid membrane.
A laryngocoele may also be primary or secondary (due to obstructing lesion such as tumour)
Radiographic features
CT
Typically seen as a well defined mass in relation to the para laryngeal space. The extent will obviously depend on sub type. Can be variable in attenuation characteristics due to differing content (e.g. air, fluid, mucus etc). Continuity with the airway is important for diagnosis.
Complications
- infection : infected laryngocoele is known as a pyolaryngocoele
- increased risk of laryngeal carcinoma occurring within
