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Rapid Multifocal Neurologic Decline in an Immunocompromised Patient. A man in his early 70s with a diagnosis of chronic lymphocytic leukemia and being treated with prednisone, fludarabine, cyclophosphamide, and rituximab presented with progressive multifocal neurologic decline. The patient died 2 months after the onset of this decline despite extensive clinical and laboratory investigation and a trial of methylprednisolone therapy. The approach to the immunosuppressed patient with progressive neurologic decline, neuropathologic findings, and final diagnosis are discussed.