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Ranula
A ranula is a type of mucocele found on the floor of the mouth. Ranulas present as a swelling of connective tissue consisting of collected mucin from a ruptured salivary gland caused by local trauma. If small and asymptomatic further treatment may not be needed, otherwise minor oral surgery may be indicated.
==Classification==
A ranula is a type of mucocele, and therefore could be classified as a disorder of the salivary glands. Usually a ranula is confined to the floor of the mouth (termed a "simple ranula"). An unusual variant is the cervical ranula (also called a plunging or diving ranula), where the swelling is in the neck rather than the floor of the mouth. The term ranula is also sometimes used to refer to other similar swellings of the floor of mouth such as true salivary duct cysts, dermoid cysts and cystic hygromas.〔 The Latin word ''rana'' means "frog" (ranula = "little frog"), and also now refers to a genus of frogs. The etymology of the term is usually explained by a resemblance with the underbelly,〔 or the bulging throat of a croaking frog. Alternatively, ranula is described as being derived from the Greek word for "the swollen area below the mouth of a frog".〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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