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What is the most common symptom of a subarachnoid haemorrhage (SAH)?
Thunderclap headache
What is the most common cause of a subarachnoid haemorrhage (SAH)?
Ruptured berry aneurysm (85%)
A subarachnoid haemorrhage secondary to rupture of a berry aneurysm in the lateral base of the calvarium is depicted. Note that the blood is not confined by sutures (extradural) and is not contained between dural layers (subdural).