PMC8818851_01
(A) The X-slice. (B) CT coronal section: crown sign. (C) CT transverse position: ring high. (D) CT Median sagittal section: linear calcification. (E) MRI T1 phase. (F) MRI T2 phase.
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F1
Cervical spondylosis was suspected and a cervical X-ray showed that the atlantoaxial joint space was wide on the left side and narrow on the right side (Figure 1A). CT three-dimensional (3D CT) images showed high-density shadows of the atlantoaxial joint in the coronal, transverse sections (Figures 1B,C) and median sagittal sections suggesting linear calcification (Figure 1D). Cervical MRI indicated C3/4, C4/5, C5/6 and C6/7 disc herniation, corresponding to spinal dural sac compression and spinal canal stenosis (Figures 1E,F).