UNUSUAL PRESENTATION OF MONOSTOTIC FIBROUS DYSPLASIA IN MANDIBLE: REPORT OF A RARE CASE.

Fibrous dysplasia (FD) is a benign bone lesion characterized by replacement of normal bone by fibro-osseous connective tissue exhibiting varying degrees of osseous metaplasia. There is not a definite etiology of FD, but it is believed to arise from abnormal activity in the bone forming mesenchymal tissue. Trauma was also believed as a causative factor. The average age of the patients with FD is 25.8 years, without sex preference (46. 7% male) and usually manifests before the 3rd decade of life. Patients with jaw involvement first may complain of unilateral facial swelling. Pain and pathologic fractures are rare. Although expansion is the common sign in FD and the maxilla is more involved, this case, report an unusual type of FD in that the mandible of a middle aged woman was involved; the expansion was little and the main sign of the patient was pain and disesthesia which are the rare signs of FD. [ABSTRACT FROM AUTHOR]