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Figure 1: Magnetic resonance imaging of the brain diff usion-weighted image (a) showed diff usion restriction in the left parietooccipital region, which was suggestive of acute infarct. Magnetic resonance angiogram of the intracranial vessels (b) revealed narrowing of bilateral supraclinoid internal carotid arteries, nonvisualization of bilateral middle cerebral arteries and distal part of posterior cerebral arteries along with extensive collateralization of vessels, creating a “puff of smoke” appearance

Figure 1: Magnetic resonance imaging of the brain diff usion-weighted image (a) showed diff usion restriction in the left parietooccipital region, which was suggestive of acute infarct. Magnetic resonance angiogram of the intracranial vessels (b) revealed narrowing of bilateral supraclinoid internal carotid arteries, nonvisualization of bilateral middle cerebral arteries and distal part of posterior cerebral arteries along with extensive collateralization of vessels, creating a “puff of smoke” appearance