Diffusion MRI in Rasmussen's encephalitis, herpes simplex encephalitis, and bacterial meningoencephalitis.
Three patients with Rasmussen's encephalitis, herpes simplex type 1 encephalitis, and bacterial meningoencephalitis are included in this study. Echo-planar diffusion MRI was acquired with the trace protocol at 1.5 T. b= 1000 s/mm(2) images, and apparent diffusion coefficient (ADC) maps were studied with respect to lesion identification. ADC values were also studied, and compared to those of 25 normals. In Rasmussen's encephalitis b= 1000 s/mm(2) images were uninformative while ADC maps had superior information. In herpes simplex type 1 encephalitis both b= 1000 s/mm(2) images, and ADC maps had diagnostic information. In meningoencephalitis b= 1000 s/mm(2) images had superior information, especially with respect to early cerebritis while ADC maps were negative. In conclusion, diffusion MRI provided useful imaging data on different types of encephalitis, either on b= 1000 s/mm(2) images or on ADC maps, or on both.
Department of Radiology, Ege University Hospital, Bornova, 35100, Izmir, Turkey. rnsener@hotmail.com
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D000293:Adolescent; D001921:Brain / Q000473:pathology*; D002648:Child; D038524:Diffusion Magnetic Resonance Imaging; D017352:Echo-Planar Imaging; D004660:Encephalitis / Q000175:diagnosis*; D020803:Encephalitis, Herpes Simplex / Q000175:diagnosis; D006801:Humans; D008297:Male; D008585:Meningitis, Meningococcal / Q000175:diagnosis; D008590:Meningoencephalitis / Q000175:diagnosis / Q000382:microbiology