Abstract
Benign fibrous histiocytoma occurs commonly in the limbs and abdomen and is very rare in the oral region, especially the mandible. A 22-year-old woman presented with pain of the posterior part of the mandible. Radiographs showed a radiolucent lesion extending from the mandibular left second premolar to the left first molar on panoramic radiographs, enlarging the mandibular bone on CT. The clinical diagnosis was a benign tumor of the mandible, and the tumor mass was surgically extirpated. Histological examination revealed mixed proliferations of fibroblastic and histiocytic cells without cell atypism and mytosis. Immunohistochemical and ultrastructural analysis supported the presence of fibroblastic and histiocytic cells. Histopathologically, our case was diagnosed to be benign fibrous histiocytoma. The postoperative course was good, and no sign of recurrence has been noted for 1 year after operation.
