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Middle cerebral artery fenestration

Middle cerebral artery (MCA) fenestration is a very rare anatomical variant of the middle cerebral artery, incidentally found during MR or CT angiography. It has an incidence of ~0.6% (range 0.2-1%) 1.

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

It may mimic a dissection.

Anatomy: Brain

Anatomy: Brain

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Article information

rID: 25992
Section: Anatomy
Tag: cases, refs
Synonyms or Alternate Spellings:
  • Fenestration of the MCA
  • Fenestration of the middle cerebral artery
  • MCA fenestration

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Cases and figures

  • Figure 1: illustration
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  • Case 1: with ICA aneurysm
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  • Case 2: right MCA fenestration
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