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Radiological classification of azygos anterior cerebral artery and evaluation of the accompanying vascular anomalies

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Abstract

Purpose

There is not a classification of azygos anterior cerebral artery (ACA) based on anatomical branching levels in the literature. In the present study, a classification of azygos ACA was made based on radiological imaging for a common terminology, and frequency, accompanying vascular anomalies and malformations were investigated.

Methods

A total of 4913 cases who had brain CTA, MRA, contrast-enhanced MRI and DSA in January 2010–January 2020 period were screened for the study. Based on anatomical branching level, azygos ACAs were classified into four groups. Aneurysms, anomalies and malformations accompanying azygos ACA were identified. The associations of azygos ACA types with the presence of aneurysm or ACA A1 segment anomalies were investigated.

Results

Azygos ACA was observed in 57 cases (29 male and 28 female) and frequency of azygos ACA was 1.16%. Average age of the cases with ACA was 56.19 ± 19.65 years. Forty-eight of the cases had type C azygos ACA, four cases type B, four cases type D and one case type A azygos ACA. A total of nine intracranial aneurysms were identified in seven of the cases (12.28%). Five of the aneurysms were located in MCA and four in distal ACA. Most common vascular anomalies accompanying azygos ACA were unilateral vertebral artery hypoplasia and ACA A1 segment hypoplasia. Azygos types did not have significant correlations with the presence of aneurysms or ACA A1 segmental anomalies (p = 0.683 and p = 0.949, respectively).

Conclusion

Azygos ACA is a rare variation, but it could be accompanied by aneurysms or other vascular anomalies.

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All data generated or analysed during this study are included in this published article.

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Acknowledgements

We thank Osman Demir for the help with the statistical analyses.

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Authors and Affiliations

  1. Department of Radiology, Tokat Gaziosmanpaşa University Faculty of Medicine, Kaleardı Mah., Muhittin Fisunoglu Cad., 60100, Tokat, Turkey

    Murat Beyhan & Erkan Gökçe

  2. Department of Radiology, Niğde Ömer Halisdemir University Faculty of Medicine, Niğde, Turkey

    Kayhan Karakuş

Authors
  1. Murat Beyhan
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  2. Erkan Gökçe
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  3. Kayhan Karakuş
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Contributions

MB: data collection, analysis, writing. EG: data collection, analysis, writing and final editing. KK: data collection and revision.

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Correspondence to Murat Beyhan.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of our research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Beyhan, M., Gökçe, E. & Karakuş, K. Radiological classification of azygos anterior cerebral artery and evaluation of the accompanying vascular anomalies. Surg Radiol Anat 42, 1345–1354 (2020). https://doi.org/10.1007/s00276-020-02509-4

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  • DOI: https://doi.org/10.1007/s00276-020-02509-4

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