Intraventricular haemorrhage without subarachnoid haemorrhage due to a ruptured aneurysm.

The incidence of aneurysmal subarachnoid haemorrhage (SAH) in the UK is about 10 per 100 000 of the population per year and it is a potentially fatal condition. Prompt recognition and referral to a neurosurgical unit is crucial for a better outcome. A typical history of sudden severe headache, CT scan and sometimes a lumbar puncture would help clinch the diagnosis.