舌下囊腫
Ranula \Ran"u*la\, n. [L., a little frog, a little swelling on the tongue of cattle, dim. of rana a frog.] (Med.) A cyst formed under the tongue by obstruction of the duct of the submaxillary gland.
ranula n : a cyst on the underside of the tongue [also: {ranulae} (pl)]