Fibrous histiocytoma is a heterogenous group of mesenchymal tumors that is primarily composed of fibroblasts & histiocytes. The most common site of occurrence of these lesions is on the skin of extremities. Intraoral benign fibrous histiocytomas (BFH)s are commonly seen in the soft tissues of the buccal mucosa, gingiva, lips, soft palate & floor of the mouth. However its occurrence in deeper soft tissues (less than 1%) & intrabony locations is not unusual. Jaw bones are found to be the rarest sites, as till date only two cases in maxilla & six in mandible have been reported. Also BFH represents a pathologist's phantasm because histologically & morphologically it mimics many other soft tissue tumors. Because of lack of presence of specific immunohistochemical marker for BFH, diagnosis is confirmed on exclusion basis. A case of BFH at an unusual location-mandibular paraosteum is reported here along with its pathogenetic & diagnostic perspective.
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