Treatment of a ranula using an Er,Cr:YSGG laser.

A ranula is an extravasational cyst arising from the sublingual gland. The "cyst" cavity does not have an epithelial lining, and because of this is notoriously difficult to eliminate. Usual treatment requires complete excision of the sublingual gland, exteriorizing the gland through establishment of a secondary ductal structure by placement of a long-term indwelling catheter, or packing, all requiring patient compliance.