Fig. 1

A-F CT images of cervical vertebra depict intervertebral disc calcification at the C2/3 and C3/4 levels, with protrusion of OPLL at posterior edge of the C2 vertebral body and the C2/3 intervertebral disc level, encroaching into the spinal canal; G-I MRI scans of cervical spine demonstrate a reduction in signal intensity in T2WI for the C2/3 and C3/4 intervertebral discs, as well as the posterior longitudinal ligament of the C2 vertebral body. In the transverse plane, the PLL at the C2/3 level exhibits central-left herniation, resulting in slight compression of the dural sac