The term mucocele was derived from a latin word , mucu stands for mucus and coele means a cavity. Therefore mucocele is defined as a mucus-filled cyst that may appear in the oral cavity. It’s the seventeenth most common salivary gland lesion of the oral cavity.
Mucoceles are of two types, namely the mucus extravasation phenomenon or mucus escape reaction and mucus retention cyst also called salivary duct cyst or sialocyst.
The mucus extravasation phenomenan or mucus escape reaction are associated with minor salivary glands and are formed secondary to rupture of excretory duct of the gland. This rupture of the salivary gland duct leads to consequent spillage of saliva from the duct into the connective tissue around the gland. The mucous becomes walled off and causes a cyst like swelling but are not lined by an epithelium, that’s why they are called pseudocysts or false cysts.
The spillage of mucous in extravasation phenomenon may result from local trauma to the salivary gland ducts. Although in many cases there may be no known history of trauma.
On the other hand mucus retention cysts are formed secondary to obstruction of the duct which leads to accumulation of saliva either within the gland or within its duct. Prolonged obstructions within the gland or duct causes further fluid accumulation and results in swelling. This salivary obstruction leading to development of a cyst might result from calculus formation, scarring and obstruction from mucin plug. Unlike mucus extravasation phenomenon, mucus retention cyst is a true cyst, meaning that its lined up by a layer of salivary epithelium.
Video(diagrams+editing) & Voiceover:
Dr. Maryam Kazman
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