Revision 20 for 'Basilar artery fenestration'

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Basilar artery fenestration

Basilar artery fenestration (or more simply, basilar fenestration) is the most common intracranial arterial fenestration. It refers to duplication of a portion of the artery. Its reported is highly variable depending on the technique used:

  • ~0.5% (0.3-0.6%) at angiography (presumably low due to preferential laminar flow in only one lumen at a time)
  • 2% on MRA
  • up to 5.26% at autopsy

Typically fenestration occurs at at the lower end of the basilar artery just as the vertebral arteries join. However, it can also be seen in the mid-basilar and distal tip.

There is an increased incidence of basilar aneurysm formation at the site of fenestration, presumably due to abnormal flow dynamics. They are reported in 7% of fenestrations.

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