Well-defined, thin-walled, air-filled cystic lesion is seen in the right paraglottic space communicating with the laryngeal ventricle. An extralaryngeal extension through the thyrohyoid membrane is seen. 

Similar yet smaller well-defined, thin-walled, air-filled cystic lesion is seen in the left paraglottic space communicating with the laryngeal ventricle. No extralaryngeal extension.

Opinion:

• Right combined external and internal layrngocele
• Left internal layrngocele. 

Risk factors

Raised intralaryngeal pressure secondary to excessive cough,playing woodwind/brass instruments, glass blowing, obstructing lesion, e.g. tumor

NB: The finding of a laryngocele should prompt a search for an underlying laryngeal carcinoma obstructing the orifice of the laryngeal ventricle.