Fig. 1.

Initial magnetic resonance images of the patient. a Right paramedian sagittal T2-weighted image of the cervical spine. A low signal intensity mass lesion with a hyperintense signal at the center can be observed in the spinal canal at the C1–2 level (arrow). b Axial T1-weighted image of the cervical spine at the C2 level. A mass lesion of homogenous low signal intensity can be observed in the right extradural space (arrow). c Coronal T2-weighted image of the cervical spine. A “dumbbell-shaped” extradural mass lesion of mixed signal intensity can be observed in the right C1–2 intervertebral space with compression of the spinal cord (arrow)