PMC5733951_01
(a) A CT angiogram showing a persistent trigeminal artery arising from the left cavernous internal carotid artery and supplying the mid-distal basilar artery (red arrow). (b) A CT angiogram of the neck revealing the severely stenosed left internal carotid artery (red arrow).
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fig1
The CTA further showed a PTA supplying the mid and distal basilar artery (Figure 1(a)) and severe atherosclerosis and stenosis of the proximal ICA (Figure 1(b)).
(a) An MRI of the brain revealing areas of restricted diffusion in the left carotid artery distribution. (b) MRI of the brain showing new infarcts in the superior cerebellum and occipital lobe, within the PTA territory.
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fig2
Findings were most consistent with emboli originating from the severely atherosclerotic left ICA, reaching the posterior fossa via the PTA (Figure 2).