A retention cyst or mucocele occurs due to a blockage followed by accumulation of saliva in the efferent duct of a gland leading to its dilatation. Clinically, there is no difference apparent between retention cysts or extravasation cysts, both are bulging and bluish, but the retention cyst is less frequent. If the cyst is located in the ductus of the glandula sublingualis, it is called Ranula. Its extending diameter and fluctuant mass often leads to discomfort with swallowing. Either rupture or blockade of the duct can be the cause.
Marsupialisation is the treatment of choice.