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In page Ramsay Hunt syndrome type 2:

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Ramsay Hunt Syndrome type 2 can usually be diagnosed based on clinical features. However, for suspected cases with unclear presentation, varicella zoster virus can be isolated from vesicle fluid. Tear culture PCR can have positive varicella zoster virus. However, 25–35% of patients with Bell's palsy can have false positive varicella zoster virus detected in tears. If central nervous system complications such as meningitis, ventriculitis or meningoencephalitis are suspected, prompt lumbar puncture with spinal fluid analysis and imaging (CT head) are recommended.[citation needed]