Aneurysmal bone cysts of the spine.

Aneurysmal bone cysts are uncommon bony lesions of the spine. Two such patients are reported in the study. The first patient had involvement of first and second thoracic vertebrae, and a preoperative diagnosis was made possible due to the typical magnetic resonance imaging appearances. A total removal was achieved in two stages. In the second patient the C2 spinous process was involved, and this patient presented as atantoaxial dislocation. Removal of the abnormal tissue and posterior fusion was done. Both the patients showed neurologic improvement. The relevant literature is reviewed.