A retention-type cyst of the supraglottic structures not manifesting as either an anterior or lateral saccular cyst. With a supraglottic cyst, the duct of a single gland is thought to become obstructed and to thereby retain secretions. By contrast, with a saccular cyst, the mouth of the laryngeal saccule becomes obstructed.
Supraglottic cyst (1 of 2)
On panoramic view, one can see that this is not an anterior saccular cyst, as it does not protrude from the ventricle.
Supraglottic cyst (2 of 2)
Closer view, with obvious translucence, verifying that this is a ductal cyst and not a saccular cyst, which is deeper within the false cord and aryepiglottic cord.