Fig. 3From: A case report of revision occipital-cervical fusion after atlanto-axial instrumentation failure for neurofibromatosis type IRecurrence of atlanto-axial dislocation. a Anterior–posterior radiography image. b Sagittal radiography imaging. The upper atlantodental interval was 8.5 mm. c Computed tomography sagittal image showing the recurrence of the atlanto-axial dislocation. d Computed tomography axial image showing the fracture of the C1 laminaBack to article page