24-hour EEG showed non-specific slow wave in the frontal area. Brain MRI (1.5T) found the T1 hypointense, T2 and Flair hyperintense lesion in right brachium pontis (Fig. The analysis of ANA, dsDNA Ab, ANCA, APL, erythrocyte sedimentation rate, C-reactive protein, thyroid function, tumor markers, HIV, syphilis, and hepatitis B virus were all normal. After admission, the first cerebrospinal fluid (CSF) examination showed a pressure of 300 mm H2O, colorless and transparent cerebrospinal fluid, pleocytosis of 249×10 6/L (multinuclear cell 0.1, mononuclear cell 0.9), normal concentration of protein, glucose, and chloride.
At the time of admission, neurological examination revealed clear consciousness and speech, normal cranial nerve, grade 5 of limbs muscle strength on Muscle Strength Grading Scale, normal sense, unstable left finger-nose test and heel-knee-shin test, positive Babinski’s sign in left, suspiciously positive stiff-neck, and negative Kernig sign. A 15-year-old boy was admitted to our hospital because of a headache for 2 weeks, episodes of convulsions with fever for 3 days.
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