Potential causes for a delayed headache in subarachnoid hemorrhage

What are potential causes for a delayed headache in a patient with subarachnoid hemorrhage?

The most important causes to rule out for a patient with a delayed headache following subarachnoid hemorrhage are hydrocephalus and aneurysm re-rupture. If these causes have been excluded, the later phases of headache are more likely due to vasospasm and aseptic meningitis.


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