**9. Conclusion**

Fever, headache, and meningeal irritation findings are generally accepted as the clinical fea‐ tures of meningitis syndrome. When CSF findings are not characteristically compatible with bacterial or tuberculosis meningitis, it is usually defined as aseptic meningitis. Some cases with SIH, those admitting with signs of meningeal irritation, decreased cognitive levels, and various neurological signs and symptoms including hyperexcitability and status, may mim‐ ic meningoencephalitis. The characteristic features of SIH should promptly be searched in those cases. If the headache is in orthostatic nature, CSF opening pressure is low and charac‐ teristic MRI findings are present, the diagnosis would be established as SIH. The diagnostic criteria defined by International Headache Society would be suggested to exclude SIH in the differential diagnosis.
