Calcifying epithelial odontogenic tumor: histochemical and electron microscopic observations on a case.

A case of calcifying epithelial odontogenic tumor was studied histochemically and electron microscopically. This case was characterized by an abundant amount of homogeneous substance and the presence of numerous clear cells. Although the homogeneous substance was shown to be an amyloid material in nature, it was supposed to be an extracellular product of the epithelial tumor cells. The clear cells contained abundant glycogen granules in their cytoplasm.