Figure 1.

A. Emergency digital subtraction angiography (DSA) showed serious and irregular narrowing of the left vertebral artery (red arrows). B. DSA at three days after admission showed stenosis was relieved (red arrows). C. T2-weighted MRI of the cervical spine cord showed patches of high signal intensity between the C1 and C4 vertebral bodies (yellow arrows). D. T2-weighted MRI, performed at 33 days after stroke onset, showed syringomyelia in the cervical cord (yellow arrow)."

Figure 2.

A. Dual lumen sign (blue arrows) was shown on arterial phase image of CT angiography (CTA), and a zoomed image was provided on lower left corner of the picture. B. CTA of half a year after the patient was discharged showed a smooth vertebral artery. "