Basilar artery fenestration and aneurysms with subarachnoid hemorrhage
Presentation
Unconscious collapse.
Patient Data
Hyperdensity inseparable from the prepontine basilar artery, suspicious for aneurysm. A small volume of subarachnoid hemorrhage in the Sylvian fissures and at the vertex as well as a small volume of intraventricular blood in the left trigone.
Incidental bilateral choroid plexus xanthogranuloma.
Basilar artery fenestration with anteriorly (larger) and posteriorly projecting aneurysm at the vertebrobasilar junction.
DSA confirms basilar artery fenestration and aneurysm.
Case Discussion
Basilar artery fenestration is not uncommon and is usually an anatomical variant although there is an increased incidence of cerebral aneurysm.