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[An unusual form of primary epithelioma of the mandible: odontogenic clear cell carcinoma. Clinical and morphologic study].

One case of aggressive intramandibular epithelial tumor is presented. This tumor demonstrated an unusual pattern with areas of follicular ameloblastoma together with undifferentiated trabeculae or lobules composed of basophilic cells and of clear glycogenic-rich cells. The odontogenic nature of this tumour and its analogies with common ameloblastoma were demonstrated by electron microscopy, immunohistoenzymology and immunohistochemistry. The signification of such a neoplasm is discussed.