1. Obstructive hydrocephalus from haematoma in the aqueduct.
2. Communicating hydrocephalus from failure of absorbtion by the arachnoid villi.
3. Vasospasm at 1 week producing brain infarction in associated territory.
4. Rebleeding at 2 weeks.
Common sites for aneurysm formation is at the points of bifurcation:
■ anterior communicating artery 30%,
■ posterior communicating artery 30%, 225
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