PMC6698545_01
Case 1: 5-year-old girl with Down syndrome.. (A) Preoperatively, CT demonstrated atlantoaxial dislocation, os odontoideum, atlas-dens interval (ADI) of 8.8 mm, and space available for spinal cord (SAC) of 7.0 mm.. (B) MRI suggested high intensity change in the spinal cord on the T2 weighed at the cervicomedullary junction.. (C, D) Postoperatively, X-ray imaging revealed O-C2 hybrid fusion.. (E) On follow-up CT, bone union was confirmed.. (F) Anterior view of 3D constructed CT demonstrates the bilateral C2 pedicle screws and C2 laminar screws.
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Bone union was confirmed during follow-up examinations (Fig. 2).
PMC6698545_02
Case 2: 8-year-old boy with atlantoaxial rotatory fixation.. (A) X-ray imaging revealed torticollis.. (B, C) 3D CT demonstrated the assimilation of C1 bifida and C1 right posterior arch with the occipital bone. Right vertebral artery was obstructed, and left vertebral artery was dominant.. (D, E) Postoperatively, X-ray imaging revealed O-C2 hybrid fusion.
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Bone union was confirmed during follow-up examinations (Fig. 3).