inflammation of CSF in arachnoid space in meninges due to infective and non-infective causes

<aside> 💡 classic triad Fever, Photophobia, neck stiffness

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Demographics: children (particularly with cochlear implant, head trauma or recurrent sinus infections), immunocoprimised

Risk Factors

• Chronic medical disorders (renal failure, diabetes, adrenal insufficiency, cystic fibrosis)
• Extremes of age
• Unvaccinated
• Immunosuppressed (ASPLENIA)
• Living in crowded conditions
• infectious contact
• Alcohol use disorder
• Bacterial endocarditis
• Malignancy
• Dural defects
• IV drug use