Basilar artery fenestration is a rare anatomical
variation resulting from the failed fusion of the two vertebral arteries during
embryonic life. In order of frequency, it is the second most common location of
vascular fenestrations after the anterior communicating artery. Vertebrobasilar
junction aneurysms are uncommon but often associated with basilar artery
fenestration. We report the case of a fenestrated vertebrobasilar junction
saccular aneurysm in a 57-year-old woman. The diagnosis was incidentally made
on CT angiography which found the anatomical variant and the aneurysm. The
radiological features illustrating this association are detailed here and a
brief discussion of its pathogenesis and management was made. Vertebrobasilar
junction aneurysms are rare and their presence should suggest an associated
basilar fenestration.
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