A 48 year-old woman developed headaches followed by spells of intermittent double vision and facial numbness.

Cerebral angiogram; left vertebral artery injection. (Left) lateal view; (Right) AP view. Note the large fusiform aneurysm affecting both the vertebral and distal basilar artery. Although aneurysms typically come to clinical attention by bleeding, rarely they will enlarge and result in a mass lesion..

Revised05/01/06.
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