Osteoma of the zygomatic arch and mandible: Report of two cases

Osteomas are benign osteogenic lesions characterized by compact and/or cancellous bone proliferation. The aetiology of these lesions remains unknown. It is usually asymptomatic and it is often detected incidentally on routine radiographic examination or until it causes facial asymmetry or dysfunction. It is characterized by very slow and continuous growth. The peripheral osteoma of the jaw is uncommon. Radiographically, peripheral osteomas are seen as oval radiopaque well- circumscribed masses attached to the cortex by a broad base or a pedicle. Three theories have been proposed: developmental, neoplasic and reactive. The possibility that peripheral osteomas may be a reaction to trauma could explain the occurrence on the lower border and buccal aspect of the mandible. The objective of this article is to present the radiographic features of two cases of osteomas, one in the lingual site of the mandibular angle and another one on the zygomatic arch. (C) 2011 Sociedade Portuguesa de Estomatologia e Medicina Dentaria. Published by Elsevier Espana, S.L. All rights reserved.