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Thank you for your question.
What are your symptoms?
Since how long are you having them?
Please let me know.
Hello. Welcome to JA I am a board certified neurologist and will answer your question.
Meningitis is an inflammation of the meninges, or the coverings of the brain. There are many things that can cause meningitis, some need a CSF evaluation to diagnose, others can be diagnosed with MRI using gadolinium (contrast). So it depends what type of meningitis you are discussing. Please get back to me to discuss this further. Let me know what symptoms you are having. For most infectious causes (but not all), you should have a fever, unless you are immunocompromised (HIV or from cancer). Dr Frank
Since your MRI and MRA were okay I do not think that you require a spinal tap, particularly since you do not have fever.
Since how long are you having these symptoms?
Do you have any other medical problems?
Are you on any medications for anything at the moment?
How tall are you? How much do you weigh? Any weight change? Does anything make your symptoms better or worse? When did they start? Are they consistent? Are they getting worse? Did they check CRP (inflammation marker) in the blood? Does anyone around you have similar problem? Any other symptoms? Are you aware of anything which might have triggered it? Any medical problems? Any surgeries? Any medications including over-the-counter pills and herbs? Any family medical history?
It doesn't seem to be meningitis. Did you have electromyography (EMG) that is abolished by intravenous diazepam or a positive therapeutic response to oral diazepam?