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Two cases excluded by the central MRI review. MRIs of two illustrative cases excluded by the central MRI review board because of deviation from the pre-set MRI criteria. Note the enlarged subarachnoid spaces (arrow) proportionate to ventriculomegaly indicating brain atrophy (A), and the open high-convexity and medial subarachnoid spaces (arrow) despite disproportionately expanded ventricles (*) suggesting chronic occlusive hydrocephalus (B).
