Bony tumour in an unusual location on the mandible

Abstract

Osteomas are benign osteogenic tumors that are seen in the facial bones, but uncommonly in the mandible. In the facial bones, both central and peripheral osteomas have been described. Peripheral osteomas have been described to occur in the frontal, ethmoid, and maxillary sinuses but are not common in jawbones. When in the mandible, they are usually found over the angle and inferior border of the mandible. We report on a solitary peripheral osteoma located unusually in the sigmoid notch of the left mandible causing facial asymmetry.

The first case of osteoma of the mandibular notch located both medially and laterally and treated with a transoral endoscopy assisted approach. A case report

“…We found only six cases in the literature located laterally, medially or in the middle of the sigmoid notch [ 4 ]. This case is thus novel because the osteoma was located both medially and laterally.…”

“…Treatment includes observation with periodic clinical and radiological examinations [ 18 ] for small, non-progressing, asymptomatic solitary lesions. Surgery should be considered for large, deforming osteomas [ 4 ]. In the present case, excision was considered, as the lesion was progressive and was causing pain during jaw movement.…”

“…They are essentially restricted to the craniofacial skeleton and are rarely, if ever, diagnosed in other bones [ 2 , 3 ]. In the literature, we found only six cases originating in the sigmoid notch of the mandible [ 4 ]. The literature describes three different types of osteomas depending on their location [ 5 ]: (1) osteomas may arise on the surface of bone as a polypoid or sessile mass (periosteal, peripheral or exophytic osteoma); (2) they may be located in the medullary bone (endosteal or central osteoma); and (3) extra-skeletal soft tissue lesions are typically located within muscle or the dermis of the skin (osteoma cutis).…”

External auditory canal osteoma: a case report

“…They are treated as benign lesions prone to local growth without tendency of metastasis. Although characterized by slow growth (7), depending on their extension and anatomical localization, problems such as functional defects, facial asymmetry and pain, difficulties with occlusion, (7) or as in our patient, and hearing level deterioration, occur. Other possible symptoms related to osteoma presence in external auditory canal include vertigo and tinnitus (5).…”

“…Etiology is unknown, yet theories discuss congenital origin, embryogenesis, trauma, infection, metaplasia, inflammation, and hormones as possible etiologic factors (1,(3)(4)(5). According to the site of origin, osteomas can be classified to peripheral (ones arising from periosteum), central (those which arise from endosteum) or extraskeletal (ones which appear within muscles) (4,6,7). Furthermore, they can be divided into those composed of compact bone, cancellous bone or their combination (3,4).…”