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Abstract #4144

Usefulness of low intensity rim sign on DWI for differentiating brain abscess, acute ischemic stroke, and hemorrhagic stroke.

Takashi Abe1,2, Maki Otomo2, Rintaro Ito1, Rei Nakamichi1, Yumi Abe1, Toshiki Nakane1, Hisashi Kawai1, Toshiaki Taoka1, Shinji Naganawa1, and Masafumi Harada2
1Nagoya University, Nagoya, Japan, 2Tokushima University, Tokushima, Japan

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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