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Figure 6: Subarachnoid hemorrhage (SAH) following anterior odontoid screw (OS) fixation (a– d). This 7-year-old patient had an upward migration of the K wire during the anterior OS fixation resulting in SAH (a) Lateral cervical radiograph showing the K wire at the base of C2 at the start of drilling in the well-reduced fracture after traction; (b) Radiograph showing upward migration of the K wire; (c) Post-operative radiograph showing the well-placed OS; (d) Post-operative computed tomography (CT) head showing the diffuse SAH with cerebral edema

Figure 6: Subarachnoid hemorrhage (SAH) following anterior odontoid screw (OS) fixation (a– d). This 7-year-old patient had an upward migration of the K wire during the anterior OS fixation resulting in SAH (a) Lateral cervical radiograph showing the K wire at the base of C2 at the start of drilling in the well-reduced fracture after traction; (b) Radiograph showing upward migration of the K wire; (c) Post-operative radiograph showing the well-placed OS; (d) Post-operative computed tomography (CT) head showing the diffuse SAH with cerebral edema