Aneurysmal bone cysts of the jaws: clinicopathological features, radiographic evaluation and treatment analysis of 17 cases.

This article re-evaluates the various clinicopathological presentations and array of radiographic features displayed by aneurysmal bone cysts (ABCs) of the jaws. In this retrospective clinical study, 17 cases of ABCs of the jaws surgically treated during an 11-year period from 1986-1997 are evaluated. The age and sex distribution, diagnostic characteristics, mode of treatment and long-term surgical results are presented and compared with the international literature. Investigation included serial clinical examinations, appropriate radiographic evaluation, CT scans and angiograms when indicated. All the patients had mandibular lesions and were managed by complete surgical curettage of the lesions. Ten were in males (58.8%) and seven (41.2%) in females. The mean age of occurrence was 21.05 years, ranging from 7 to 58 years. Clinical presentation in these patients ranged from an asymptomatic incidental radiographic finding to an expanding, rapidly progressive and destructive lesion resulting in a pathological fracture. Radiographic findings varied from unicystic radiolucencies or moth-eaten radiolucencies to extensive multilocular lesions causing bilateral expansion and destruction of the mandibular cortices. Twelve of the patients (70.5%) could recall a history of trauma. Needle aspiration with a 16 or 18 guage needle was positive, producing syringes full of blood in all but two of the cases (88.2%). Six cases (35.2%) were extremely vascular and had increased rapidly in size, and three required angiographic studies for preoperative diagnosis and differentiation from other vascular entities. Nine of the cases (52.9%) were found in the mandibular angle-ramus area. Four cases (23.5%) required extraoral surgical access for curettage while the remainder were treated intraorally. During the follow-up period, which ranged from 2-11 years, no recurrences have occurred. Restoration of facial symmetry and bone formation has been favourable in all patients, despite the fact that grafts were not used. This 11-year study shows that ABCs present with varied clinicopathological and radiographic features and thus may pose a diagnostic dilemma. As we have not noted any recurrences following surgical curettage of mandibular lesions, we feel that initial surgical resection or bone grafting is not necessary, provided that adequate access and complete curettage can be obtained.