As discussed in earlier chapters, the angiographical diagnostic criteria for moyamoya disease are stenosis or occlusion of (a) the terminal portion of the bilateral internal carotid arteries (ICA), (b) the proximal portion of the anterior cerebral arteries (ACA), and (c) the middle cerebral arteries (MCA) due to unknown causes, together with an abnormal vascular network seen in the arterial phase in that region. Consequently, if these criteria are to be followed strictly, cases with stenosis of known cause or cases with unilateral abnormalities should not be considered to be true moyamoya disease.
KeywordsProximal Portion Anterior Cerebral Artery Moyamoya Disease Terminal Portion Fibromuscular Dysplasia
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