Early onset of PRES in a patient with a subarachnoid haemorrhage due to a ruptured intracranial aneurysm.

Posterior reversible encephalopathy syndrome (PRES) is rarely associated with subarachnoid haemorrhage (SAH). We present a case involving a patient who developed PRES, prior to induction of hypertensive therapy, 2 days after the onset of a SAH due to a ruptured intracranial aneurysm.