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... Magnetic resonance imaging (MRI) showed white matter lesions around her lateral ventricles, large cavities in the center of the brain filled with cerebrospinal fluid that, from the side, are C-shaped. The type of MRI used, a FLAIR MRI, is used to more easily detect lesions, and the fluid-filled lateral ventricles appear as dark, curved spaces in the center. Doctors could see white -------- and smears around those dark spaces, indicating lesions. After doing a spinal tap and running tests on her cerebral spinal fluid, they suspected she might have a bacterial infection in her brain. So they treated her with an antibiotic and a fever reducer.

But two weeks later, her symptoms hadn't improved. The doctors repeated a FLAIR MRI and found that the white lesions had only gotten worse. They did more tests. ...