It may be. Our research group ACMCRN (Arachnoiditis and Chronic Meningitis Collaborative Research Network) are interested in this question and are working towards finalizing the infrastructure needed to start genetic studies. Our most recent study at www.bit.ly/Arachnoiditis_Research has nearly 800 participants. 50% report an autoimmune disease and another 20% are being investigated for one. Autoimmune disease tends to have a genetic component, hence there is a possibility of increased risk of developing with certain genetic issues.
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www.bit.ly/Arachnoiditis_Research