aetiology of subarachnoid haemorrhage
Last reviewed 12/2022
Aneurysmal rupture accounts for the vast majority of cases.
Classification:
- 80% due to "congenital" / berry aneursym - peak age from 40 to 50 years
- 10-15% due to other aneurysms:
- arteriosclerotic / fusiform
- inflammatory / mycotic
- traumatic
- 5% due to arteriovenous malformations - peak age from 20 to 40 years
- less than 5% due to:
- bleeding diasthesis anticoagulants, e.g. warfarin
- tumours
risk of subarachnoid haemorrhage in other family members