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​Symptoms and Signs – Differential Diagnosis of Increase White cells in CSF 
Predominantly lymphocytes
Infective meningitis: viral meningitis/meningoencephalitis, TB, fungal
(Cryptococcal), listeria!, syphilis
Inflammatory diseases, e.g. Bechet's disease, sarcoidosis, SLE, multiple sclerosis
Malignancy (meningeal infiltration): lymphoma, leukaemia, other tumours
Drugs: NSAIDs, trimethoprim
Predominantly neutrophils
Bacterial meningitis
Brain abscess eroding into the ventricles
Initial phase of viral meningitis (first 24-48 h)


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