Single door laminoplasty plus posterior fusion for posterior atlantoaxial dislocation with congenital malformation: A case report and review of literature

Figure 1 Preoperative images. A: Parasagittal computed tomography (CT) showing the posterior atlantoaxial dislocation combined with os odontoideum; B: Axial CT scan, demonstrating the C1 inner sagittal diameter (white line) = 22.51 mm and the canal sagittal diameter (black line) = 12.00 mm; C: Parasagittal magnetic resonance imaging.