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Arch Neurol. 2001;58:1538-1539.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

THE ROLE of magnetic resonance imaging (MRI) in the diagnosis of stroke is expanding. Diffusion-weighted imaging (DWI) and related MRI techniques are now commonly used in the evaluation of patients who have had a stroke; however, little is known about DWI findings in venous infarction. Diffusion-weighted imaging can disclose ischemic cell damage within minutes and differentiate cytotoxic from vasogenic edema, which conventional MRI cannot. This may make DWI very useful for the diagnosis of cerebral venous infarction. The article in this issue of the ARCHIVES by Chu et al¹ represents a significant addition to the limited experience with DWI in venous infarction.

Diffusion-weighted imaging is an MRI modality that is sensitive to the diffusion of water protons. In the setting of acute ischemia, cellular energy failure leads to cytotoxic edema, characterized by a shift of water molecules from the extracellular to the intracellular space. The resulting restricted diffusion of these . . . [Full Text of this Article]

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