Anterior communicating artery
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The anterior communicating artery (ACom) arises from the anterior cerebral artery and acts as an anastomosis between the left and right anterior cerebral circulation. Approximately 4 mm in length, it demarcates the junction between the A1 and A2 segments of the anterior cerebral artery.
The anterior communicating artery gives off numerous small branches that go on to supply the following structures:
- cingulate gyrus
- anterior columns of the fornix
- optic chiasm
- lamina terminalis
- para-olfactory areas
- ACom duplication: incidence 18%
- ACom fenestration: incidence ~15% (range 12-21%)
- ACA trifurcation arising from the ACom: incidence ~7.5% (range 2-13%)
- absent ACom: incidence 5% (at surgical dissection) 2
If the vessel is not well seen on routine angiography, cross-compression view of the ACA/ACom complex can be performed.