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Fig. 1. —2-year-old boy with moyamoya disease.

A, Conventional angiogram shows mild stenosis (arrows) of both supraclinoid internal carotid arteries (ICAs). Severe stenosis of middle cerebral artery (MCA) and anterior cerebral artery (ACA) is noted. Posterior cerebral artery was normal (not shown). Degree of moyamoya vessels (MMVs) is mild bilaterally.