Fig. 2

Initial magnetic resonance imaging: sagittal T1 (A) and T2 (B) weighted images showing the spondyloptosis of C4 (arrow) at the anterior aspect of the C5 body, and severe canal stenosis at the level of the posterosuperior angle of the C5 vertebral body (arrowhead in A). Note the close proximity between the chin and the sternum (less than 2 cm, arrowheads in A). Compressive myelopathy with high signal intensity of the spinal cord is evident on the T2 weighted image, involving the C4–C6 segment (arrowheads in B). The residual anteroposterior diameter of thecal sac was less than 5 mm