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When to Expect Negative Diffusion-Weighted Images in Stroke and Transient Ischemic Attack Stroke 39:1898-1900, Sylaja,P.N.,et al, 2008 See this aricle in Pubmed Article Abstract Baseline perfusion weighted imaging sequences may detect ischemia in a small proportion of DWI negative cases. Only those with brain stem location or lacunar syndrome were DWI negative initially and yet had a follow-up imaging confirmation of infarct or a final clinical diagnosis of stroke.

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