Anterior communicating artery

The anterior communicating artery (ACOM) arises from the anterior cerebral artery and acts as an anastomosis between the left and right anterior cerebral circulation. It is about 4mm in length and demarcates the junction between the A1 and A2 segments of the anterior cerebral artery.

Branches

Additionally, it gives off numerous small branches which go on to supply:

Normal variants

  • 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% (surgical dissection) 2

If the vessel is not well seen on routine angiography then cross compression view of the ACA/ACOM complex can be performed.


Neuroanatomy
Share article

Article Information

rID: 4804
Section: Anatomy
Synonyms or Alternate Spellings:
  • Anterior communicating artery (ACOM)
  • ACOM

Support Radiopaedia and see fewer ads

Cases and Figures

  • Drag
    Figure 1: diagram - basilar artery and circle of Willis
    Drag here to reorder.
  • Drag
    Cross Compression
    Figure 2: angiogram
    Drag here to reorder.
  • Drag
    Figure 3: ACOM fenestration
    Drag here to reorder.
  • Drag
    Figure 4: ACOM aneurysm
    Drag here to reorder.
  • Drag
    Figure 5
    Drag here to reorder.
  • Drag
    Figure 6: absent ACOM with fenestrated A1 on right common A2 trunk
    Drag here to reorder.
  • Updating… Please wait.
    Loadinganimation

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.