<prompt> All of the following are true about this condition except:Mucous extravasation cyst arising from sublingual glandTreated by marsupializationMost common structure injured during ranula surgery is submandibular ductDiagnosed by MRI  <response>: RANULA - A cystic swelling in the floor of mouth that resembles a frog belly - Term ranula should only be applied to a mucous extravastion cyst that arises from the sublingual gland. ETIOLOGY - Commonly the lesions is induced by local trauma and duct rupture, followed by mucin spillage into th surrounding soft tissues Mucosa extravasation phenomenon - Uncommonly, it is due to obstruction probably caused by mucous plug or a sialolith HISTOPATHOGOLY - Mucin accumulation surrounded by granulation and Fibrous tissue mucous extravasation phenomenon - A cyst filled mucin and lining by the ductal epithelium mucous retention cyst Clinical features - Exclusively present on the floor of mouth - Usually unilateral, lateral to midline - Smooth, dome shape, fluctuating and painless swelling - The color is usually bluish, but keep lesion may have a normal color - The size varies from a few to several centimeters in diameter. Very large lesion which may occupy the floor of mouth can also occur. Diagnosis - Diagnosis is usually made clinically Treatment - Surgical removal or marsupialization - MC structure injured during ranula surgery: Submandibular duct. 