Fig. 1. A: Magnetic resonance diffusion-weighted imaging on admission showing an extensive acute infarction in the right cerebral hemisphere. B: Magnetic resonance angiography on admission showing occlusion of the right middle cerebral artery and basilar artery (BA). Bilateral extra-cranial vertebral arteries are comparatively well visualized, but bilateral intracranial VAs and the BA are poorly visualized. An unusual branch arising from the precavernous portion of the right internal carotid artery can be seen (white arrow).
