Response by Boulouis et al to Letter Regarding Article, “Primary Angiitis of the Central Nervous System: Magnetic Resonance Imaging Spectrum of Parenchymal, Meningeal, and Vascular Lesions at Baseline”
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We thank Dr Stanley et al for pointing out a potentially important aspect of the ischemic insult in primary and secondary cerebral vasculitis as assessed by signal changes in diffusion-weighted imaging. The authors report that, in their experience, both diffusion-weighted imaging positivity and decreased diffusion coefficient on apparent diffusion coefficient maps can be sustained long after 3 weeks in those pathological conditions. This is of importance, given the fact that acute ischemic lesions, detected by magnetic resonance imaging diffusion-weighted imaging sequences, are known as the most prevalent feature of primary angiitis of the central nervous system at …