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HardNeurologySubarachnoid HaemorrhageNICE Subarachnoid Haemorrhage Guideline

A 23-year-old female experiences a sudden onset severe headache described as 'thunderclap', reaching maximum intensity within seconds. She has neck stiffness on examination. CT head is normal. According to NICE, what is the next best investigation to rule out subarachnoid haemorrhage?

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