Grade II vertebral artery injury dissection on imaging

A 21-year-old male presented to the emergency department following blunt trauma while riding an all-terrain vehicle. CT angiography of the neck in the axial view (A), and reconstructed in the coronal plane (B), shows a sub-total occlusion of the right vertebral artery (arrows). The left vertebral artery (arrowhead) is normal. Digital subtraction arteriography (C) demonstrates a linear filling defect (arrow), consistent with dissection.