Large peripheral osteoma of the mandible: a case report

Abstract

Osteomas are benign, slow-growing osteogenic tumors commonly occurring in the craniofacial bones. Osteomas are characterized by the proliferation of compact and/or cancellous bone. It can be of a central, peripheral, or extraskeletal type. The peripheral type arises from the periosteum and is rarely seen in the mandible. The lingual surface and lower border of the body are the most common locations of these lesions. They are usually asymptomatic and can be discovered in routine clinical and radiographic examination. In this paper, we presented a large solitary peripheral osteoma located in the buccal surface of the left posterior mandible and causing facial deformity in a 37-year-old woman. Radiographic examination by computed tomography revealed radiopacity with a well-circumscribed, pedunculated mass approximately 3 cm in size. The osteoma was removed surgically, and no recurrence has been observed.

Figure 1

Extraoral photograph shows a swelling on the left posterior body of the mandible.

Figure 2

Intraoral view showing a well-defined, round swelling covered by normal oral mucosa on the buccal plate of the left posterior mandible.

Figure 3

Panoramic radiograph showing a solitary, round, 3 × 3 cm well-defined radio-opaque mass without a radiolucent rim on the left side of the body of the mandible. The lesion extended distally of the second premolar till the mesial aspect of the second molar distal root.

Figure 4

Coronal Computed tomography (CT) showing a large, well-circumscribed, pedunculated mass attached to the buccal surface of the left mandibular body. Three-dimensional reconstruction image showing localisation and extending of the lesion.

Figure 5

Mucoperiostal flap was removed and the entire lesion was found out.

Figure 6

Microscopic features of peripheral osteoma consisting of mature lameller compact bone (haematoxylin-eosin, original magnification ×200).