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(a) Coronal and (b) axial computed tomography (CT) angiography in the early arterial phase and (c) oblique sagittal and (d) axial CT angiography in the early venous phase in an 84-year-old man with a four-month history of gait instability. (a and b) Central poor opacification in the basilar artery (white arrows), concerning for intraluminal thrombus. (c) Focal severe left vertebral artery stenosis (white arrow). (d) No evidence of thrombus in the basilar artery (white arrow).
