Outcome in patients with subarachnoid haemorrhage and negative angiography according to pattern of haemorrhage on computed tomography

15% of patients with spontaneous subarachnoid haemorrhage have normal cerebral angiograms; they fare better than patients with demonstrated aneurysms, though rebleeding and cerebral ischaemia can still occur. In patients with a normal angiogram and accumulation of blood in the cisterns around the mi...

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