Aneurysmal bone cyst of temporal bone

Abstract

SUMMARYAneurysmal bone cysts (ABC) are benign neoplasms frequently occurring in the long tubular bones. It is very rare in temporal bone. We report a case of ABC of the left temporal bone in an 8-year-old Asian boy who presented clinically with swelling over the left temporal region for 5 months. CT and MRI features were suggestive of ABC. Surgical resection was performed and on follow-up the patient was doing well. CT and MRI are the imaging modalities for proper evaluation of ABC, aiding to diagnosis and helpful in treatment planning. BACKGROUND

Temporal aneurysmal bone cyst: cost-effective method to achieve gross total resection

“…Radiologically, they have a characteristic expansile bony growth on head CT with multiple septations. MRI shows an extraaxial lesion with a soap-bubble appearance on T2W images, having fluid levels representative of blood inside the bony septa and ballooning of the bone [3]. Rarely they may have infiltration of the dura as well.…”

“…Two forms of ABCs have been described, primary and secondary, with secondary lesions seen in association with non-ossifying fibroma, giant cell tumor, chondroblastoma, fibrous dysplasia, and so on [3]. Lichtenstein suggested that ABCs could result from a local circulatory disturbance because of sudden vascular occlusion of venous drainage of that segment of the bone or development of an arterio-venous shunt.…”

“…Gross total surgical resection of the lesion forms the primary treatment modality since the residual tumor leads to early recurrence. The role of radiotherapy (RT) is not clearly defined and may be advocated for those with residual or recurrent lesions [3].…”

Solid Variant of Aneurysmal Bone Cyst of the Temporal Bone

“…19 In our review of temporal bone ABCs, we noted that the petrous portion of the temporal bone was the most commonly involved site and that ABCs rarely extended to more than 1 portion of the temporal bone. Three cases described ABC involvement of the petrous and squamous portions, 7,15,16 with no prior reports of concurrent involvement of the mastoid, petrous, and squamous portions.…”

“…This report is the ninth histologically confirmed case of ABC of the temporal squamosa in the English literature 7,[10][11][12][13][14][15][16] and the first report of ABC of any subtype involving the petrous, mastoid, and squamous portions of the temporal bone. This is also the first reported case of SVABC of the temporal bone.…”