Metrizamide meningitis.

A 39-year-old man had fever, nuchal rigidity, vomiting, and mental confusion within 24 hours after myelography with metrizamide, a water-soluble contrast medium. Cloudy cerebrospinal fluid showing pleocytosis, a significantly elevated level of protein, and a low glucose value suggested septic meningitis, but rapid resolution of signs of meningeal irritation and negative spinal fluid cultures made chemical meningitis due to the metrizamide the likely diagnosis.