<prompt> All are true about external laryngocele except:Produces a swelling in the neck on ValsalvaCommunicates with laryngeal ventricleCan be seen on CTHerniates through cricothyroid membrane  <response>: A laryngocele is an air sac formed by dilatation and prolongation of laryngeal saccule and is in communication with the ventricle. It herniates through thyrohyoid membrane. 