32 year old man with severe headache

A 32-year-old man is admitted one hour after the sudden onset of severe headache, which he described as like 'being hit on the head with a hammer'. You suspect subarachnoid haemorrhage, but a CT scan of the brain is reported as normal.

To pursue the diagnosis you should:
A. Wait for12 hours after the onset of headache, then perform a lumbar puncture to look for xanthochromia B. repeat the CT scan C. perform a lumbar puncture to look for xanthochromia as soon as possible D. perform a lumbar puncture to look for red blood cells in the CSF as soon as possible E. refer to neuroradiologist for cerebral angiography.


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