Salivary mucoceles are accumulations of salivary secretions that have leaked from damaged salivary glands or ducts into the soft tissues. Salivary mucoceles have also been referred to as sialoceles and salivary cysts. The latter term is incorrect. Thelining of a sialocele is not secretory nor is it epithelial, both of which are required to qualify the mucocele as a true cyst. Instead, the lining of the mucocele is composed of fibrous granulation tissue which results from the tissue's reaction to the presence of a foreign substance.
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