Intracranial arterial fenestration

Intracranial arterial fenestration refers to segmental duplication of the intracranial arteries. They are rare anomalies, felt to result from incomplete fusion of primitive embryologic vessels. 

Fenestration is the division of lumen of the vessel into two separate and parallel channels which rejoin distally 1. It usually does not have any clinical significance but an aneurysm may arise from the proximal part of fenestration 2.

Fenestration is more common in the posterior circulation. The rate of fenestrations based on published angiographic series has been much lower than that at cadaveric series. Reported incidence of intracranial fenestration on imaging series is 3:


Neuroanatomy
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Article Information

rID: 5876
Section: Anatomy
Tag: variant
Synonyms or Alternate Spellings:
  • Intracranial artery fenestration
  • Fenestration of intracranial arteries

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    Case 1 - fenestrated ACA bilateral
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    Case 2 - fenestrated left vertebral
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    Case 3 - complex Acom fenestration
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    Case 4 - fenestrated left vertebral
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    Case 5 - left A2 segment fenestration
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    Case 6 - MCA
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