Radiological classification of azygos anterior cerebral artery and evaluation of the accompanying vascular anomalies
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ORIGINAL ARTICLE
Radiological classification of azygos anterior cerebral artery and evaluation of the accompanying vascular anomalies Murat Beyhan1 · Erkan Gökçe1 · Kayhan Karakuş2 Received: 15 March 2020 / Accepted: 25 May 2020 © Springer-Verlag France SAS, part of Springer Nature 2020
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. Keywords Aneurysm · Azygos anterior cerebral artery · Computerized tomography angiography · Magnetic resonance angiography · Unpaired pericallosal artery
Introduction Azygos anterior cerebral artery (ACA) is a vascular anomaly characterized by the formation of a single A2 segment in the midline as a result of the persistence of the embryonic median artery of the corpus callosum. It produces branches * Murat Beyhan [email protected] Erkan Gökçe [email protected] Kayhan Karakuş [email protected] 1
Department of Radiology, Tokat Gaziosmanpaşa University Faculty of Medicine, Kaleardı Mah., Muhittin Fisunoglu Cad., 60100 Tokat, Turkey
Department of Radiology, Niğde Ömer Halisdemir University Faculty of Medicine, Niğde, Turkey
2
supplying the two ACA territories [5]. Frequency of azygos ACA variation was reported to be in a wide range of 0–10% [8, 13]. It was reported that about 9–71% azygos ACA cases had distal ACA aneurysms [4, 8, 14]. It has been known that azygos ACA is associated with predisposition to holoprosencephaly, various neuronal migration anomalies and aneurysm development [5]. There is no classification about anatomi
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