A Humphrey 24-2 visual field OS showed nonspecific defects.
The patient was hospitalized and a thorough workup was initiated. CT of the head revealed no masses or acute intracranial process. A lumbar puncture was performed. The opening pressure was normal. CSF demonstrated an elevated total protein and white blood cell count; gram stain and culture were negative. Serum titers of IgG and IgM for West Nile virus were positive