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Fig. 1B —31-year-old woman with bilateral moyamoya disease. Right internal carotid artery (ICA) arteriogram in frontal (A) and lateral (B) projections shows severely stenosed ICA and thus middle cerebral and anterior cerebral arteries are highly stenosed. Marked moyamoya vessels at level of basal ganglia are evident. Peripheral branches of middle and anterior cerebral arteries are filled via collateral vessels.