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Abstract

Ossifying fibroma (OF) is a benign, non-odontogenic tumor of the jaw, and it is classified as fibroosseous lesion of jaw. Earlier, the lesion was sub classified histologically into ossifying fibroma and cementifying fibroma according to the hard tissues formed either bone or cementum. Menzel in 1872 called it as cemento-ossifying fibroma (COF). This lesion is included in the group of mesodermal odontogenic tumors and usually present as a gradually growing lesion that might achieve enormous size with resultant deformity, if not treated. The tumor may grow quite extensively; thus, the term "aggressive" is occasionally applied. In this article, A case of cemento-ossifying fibroma involving the left side of mandible is described in a 25 year-old female patient. The clinical, radiographic, histologic features are described and several differential diagnoses are discussed.