The mucous retention cyst of the minor salivary glands represent a specific type of oral mucocele which is lined by epithelium. It is caused probably from partial or complete obstruction of a duct. It affects older patients (over 40 years of age) most commonly women and it is located in different sites than the ordinary mucocele. In this paper we studied the histologic and histochemical features of four cases. The lining epithelium varied from cuboidal to columnar or flattened. Among the cells of the lining epithelium oncocytes were observed.
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