Fig. 5

Illustrative case. A 50-year-old female presented with limbs weakness. (A) Preoperative sagittal CT showed BI-AAI with atlas occipitalization and congenital C2-3 fusion. (B) The latest-follow-up sagittal CT showed good reduction. (C) The latest-follow-up MRI showed the relieved foramen magnum stenosis. (D) Coronal CT showed good position of 3D-printed porous titanium cages. (E, F) parasagittal CT showed stable implants