2016 Volume 62 Issue 12 Pages 623-627
An osteoma is a benign tumor consisting of well-differentiated mature bone tissue and is classified as either central or peripheral osteoma. It is considered to most commonly appear on, for example, the inner and outer edges of the mandibular angle, the inferior margin of the mental region, and the lingual side of molar teeth of the lower jaw. However, a tumor arising in the mandibular ramus is relatively rare. We report the case of a patient with a peripheral osteoma that arose in the anterior border of the mandibular ramus. A 64-year-old woman consulted our department because of a painless mass of the right buccal mucosa. The right buccal mucosa showed the formation of a hemispherical mass measuring approximately 26 × 16 mm in the oral cavity. On suspecting a soft tissue benign tumor and performing imaging studies, the right mandibular ramus anterior border showed a pedunculated bone torus. We performed enucleation with the patient under general anesthesia for a clinical diagnosis of a peripheral osteoma. The histopathological diagnosis was a cancellous osteoma. Currently, 4 years 3 months after the operation, the patient has had no recurrence.
