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A clinical term used to describe a bluish, soft, often flutuant swelling caused by either blockage or rupture of a salivary gland duct. They are common on the lower lip and are caused by trauma. Histologically two types are recognized: mucous retention cysts in which the mucous is surrounded by ductal epithelium and mucous extravasation cysts. See also cyst.

Subjects: Dentistry.

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