25-year-old male, previously healthy with sudden onset of severe headache. The patient was assessed and discharged after the pain had subsided.. 5 days later, the headache returned with severe neck pain and sudden loss of consciousness.
Autopsy: aneurysm of the intracranial part of internal carotid artery. Extensive subarachnoidal bleeding. Secondary invasion of bleeding into the base of the brain.
- Cross-section through aneurysm. Irregular, dysplastic vessel. The vessel wall is thinned in places. In the given specimen the site of rupture is not evident. The vessel lumen contains plenty of fresh blood and thrombotic material.