, Volume 54, Issue 1, pp 13–18 | Cite as

Carotid–anterior cerebral artery anastomosis on MR angiography: a university hospital-based study

  • Akira UchinoEmail author
  • Naoko Saito
  • Yoshitaka Okada
  • Kaiji Inoue
Diagnostic Neuroradiology



Rarely in the anterior circulation, an anastomosis of the carotid and anterior cerebral arteries occurs when an anomalous branch arises from the ophthalmic segment of the internal carotid artery and anastomoses with the A1–A2 junction of the anterior communicating artery. Right-side predominance is known. To our knowledge, the incidence of carotid–anterior cerebral artery anastomosis has not been reported, so we researched cases in our institution records to determine incidence and investigated characteristic features of the condition on magnetic resonance (MR) angiography.


To isolate such cases, we retrospectively reviewed cranial MR angiographic images of 3,491 consecutive patients in our institution.


We found three cases with carotid–anterior cerebral artery anastomosis (two men, one woman), representing an incidence of 0.086%. The anastomosis was on the right in all three cases. A normal A1 segment of the anterior cerebral artery (ACA) was present in two cases but could not be identified in the remaining case on MR angiographic images that included source images. Two of the three patients demonstrated associated arterial variations in their carotid systems.


On MR angiography, we observed a 0.086% incidence of carotid–anterior cerebral artery anastomosis in our institution and reaffirmed the right-side predominance of this anomaly. We found a high frequency of other associated arterial variations in the carotid system.


Anterior cerebral artery Cerebral arterial variation Internal carotid artery Magnetic resonance angiography 



We thank Junji Tanaka and Yasuo Sakurai for their assistance in the preparation of MR angiographic images and Rosalyn Uhrig for the editorial assistance in the preparation of this manuscript.

Conflict of interest

We declare that we have no conflict of interest.


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Akira Uchino
    • 1
    Email author
  • Naoko Saito
    • 1
  • Yoshitaka Okada
    • 1
  • Kaiji Inoue
    • 1
  1. 1.Department of Diagnostic RadiologySaitama Medical University International Medical CenterHidakaJapan

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