[A peripheral osteoma in the mandible: diagnosis and surgical approach].

A 57-year-old man presented with a painless, hard swelling that had existed for some time, on the right side of his mandible. The patient had had an osteoma removed at the same site 20 years earlier. Surgical excision using a 3D-planned cutting guide was performed, after which, histopathological analysis confirmed the diagnosis of a (recurrent) osteoma. Osteomas are benign osseous lesions of unknown aetiology, most frequently observed in the mandible. The literature, however, also reports their occurrence in the frontal and maxillary sinuses. In cases where multiple osteomas are found, the possibility of Gardner s syndrome should be considered.