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MediumNeurologySubarachnoid Haemorrhage (SAH)ukmlamrcp part 1mrcem sbapane

A 45-year-old man with no significant past medical history presents with sudden onset severe headache, described as 'thunderclap'. He also reports neck stiffness and photophobia. His Glasgow Coma Scale (GCS) is 15/15, and neurological examination is normal. What is the single most important initial investigation?

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