Fig. 13
From: Pitfalls in the diagnosis of common benign bone tumours in children
Aneurysmal bone cyst of the second cervical vertebra (C2): a Lateral X-ray of the cervical spine: large expansile lytic lesion of the posterior arch C2 (between arrowheads). b CT, axial slice, bone windowing: confirmation of the lesion, with extreme thinning and focal interruption of the bone cortex. c CT, axial slice, soft-tissue windowing: fluid-fluid levels (arrows) are identified inside the cyst