Double vertebral arteries associated with a persistent primitive lateral basilovertebral anastomosis: A rare embryological configuration

Q: What does this research mean for the field?

A rare vertebral artery anomaly exists in which the left vertebral artery divides at the V3 segment into two separate arteries that independently anastomose with the contralateral vertebral artery and basilar artery, stemming from embryological developmental disturbances. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

Masahiro Indo; Soichi Oya; Junpei Kato; Keisuke Onoda; Akira Matsuno

doi:10.1007/s13760-026-03169-8

August 30, 2026Acta Neurologica BelgicaOpen Access

Double vertebral arteries associated with a persistent primitive lateral basilovertebral anastomosis: A rare embryological configuration

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Key Points

To describe an uncommon vascular anomaly involving duplicated vertebral arteries connected to persistent embryonic vessels and examine its developmental origin.
Clinical and angiographic evaluation of a patient presenting with an anomalous vertebrobasilar arterial architecture (N=1).
Embryological assessment tracing the persistence and fusion failures of longitudinal neural arteries, the proatlantal artery, and the primitive lateral basilovertebral anastomosis.
Identified a left vertebral artery bifurcating at the V3 segment into two persistent, separate arterial lumens.
Observed independent anastomotic connections from each duplicated branch into the contralateral vertebral artery and the basilar artery, consistent with persistent primitive lateral basilovertebral anastomotic channels.

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Implication

Case report describes a duplicated left vertebral artery in an individual patient, highlighting rare embryological mechanisms of vertebrobasilar development.

Abstract

Vertebrobasilar vascular anomalies arise from disturbances during the embryological development of the longitudinal neural arteries (LNAs), the proatlantal artery of Padget–Arey (ProA), and the primitive lateral basilovertebral anastomosis (PLBA) [ 1 , 2 ]. We report a rare vertebral artery (VA) anomaly where the left VA divided at the V3 segment and remained as two separate arteries, each independently anastomosing with the contralateral VA and basilar artery (BA). Their embryological basis and clinical significance are discussed.

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Cite This Study

Indo et al. (2026) studied this question.

synapsesocial.com/papers/6a954259f20e493292a74787 https://doi.org/10.1007/s13760-026-03169-8

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Double vertebral arteries associated with a persistent primitive lateral basilovertebral anastomosis: A rare embryological configuration

Key Points

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Implication

Abstract

Discussion

Cite This Study

Double vertebral arteries associated with a persistent primitive lateral basilovertebral anastomosis: A rare embryological configuration

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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