Although it is often difficult to differentiate brain abscess, acute ischemic stroke, and hemorrhagic stroke on diffusion weighted image (DWI), the diagnosis can be made more accurately by focusing on the low signal intensity, especially the low intensity rim surrounding the lesion. In this study, image interpretation of six diagnostic radiologists (12.8 years of experience on average) showed an accuracy of 70% before explanation of the low intensity rim finding, but the accuracy increased to 86% after explanation (p = 0.025), confirming the importance of focusing on low intensity rim on DWI.
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