A Rare Case of Peripheral Osteoma of the Zygoma

103 rare case of peripheral osteoma of the zygoma. A 41-year-old male who was referred to our hospital presented with a painless firm mass in the left malar area in January 2013. The patient first noticed this lesion 10 years earlier and became concerned as it slowly enlarged. There was no history of a specific medical event, such as trauma. The patient also did not have systemic health problems. On examination, a well-circumscribed, round and firm mass was observed on the upper border of the left zygoma. The mass was about 1.5 × 1.5 cm. There were no signs or symptoms other than swelling (Fig. 1). A computed tomography (CT) scan revealed a mass protruding from the outer cortex of the left zygoma to adjacent the anterior cheek. The exophytic mass arose from the anterior wall of the left zygoma. It appeared lobulated (Fig. 2). On the basis of the clinical and radiographic findings, a diagnosis of osteoma was made. Under general anesthesia, the bony mass was excised through a transoral approach. The gross surgical specimen was a lobulated hard bony mass (Fig. 3). It measured about 1.2 × 1.0 cm. On histopathological examination, the specimen appeared to contain normal mature compact bone (Fig. 4). The diagnosis of osteoma was confirmed. One day after surgery, the patient was discharged without any complications. There was no clinical or radiographic evidence of recurrence on follow-up visit 1 month after the surgery (Fig. 5). Osteomas are benign osteogenic lesions that grow slowly. They occur due to proliferation of either compact or cancellous bone [2,3]. Based on the location, there are three variants. Peripheral (periosteal) osteomas arise from the periosteum and proliferate as sessile or Osteomas are a benign, slow growing osteogenic tumors consisting of well-differentiated mature bone tissue [1]. Osteomas are classified as peripheral, central, or extraskeletal and peripheral is the most common of the three. Generally, the mandible and paranasal sinuses are the most common locations of peripheral osteomas in the craniofacial region [2]. However, osteoma of the zygoma is rare. We report a A Rare Case of Peripheral Osteoma of the Zygoma