Abstract
Fenestration of the basilar artery (BA) is a rare anatomical variation in comparison to those of the other intracranial arteries constituting the cerebral arterial circle. The incidence is difficult to ascertain and data vary according to type of series and modalities of detection. Basilar artery fenestration (BAF) has been reported in association with arteriovenous malformations, vascular variants, other developmental anomalies and neurovascular conflicts as a consequence of relations between the arterial branches of the BA and the nerves and other structures in the posterior cranial fossa. However, the real clinical interest of BAF is due to the possible formation of an aneurysm at the junction of the fenestrated segment and less frequently to the thrombosis of the vessels. With the aim to establish the prevalence of BAF in our population, we made a transversal pilot study of the first 200 MR angiographies performed on patients attending for the first time to control their base pathology (vascular or not). We have described three patients with this condition (representing a prevalence of 1.5 % on MR angiography) to shed additional light on this anomaly, two cases located at 1/3 proximal end (type 1-BAF) and one case located at joint 1/3 medium–1/3 distal end, locating distal to the anterior inferior cerebellar artery (type 4-BAF). In neither case was any other lesion found (i.e. aneurysm, infarctions, ischemia or thromboembolism). The pertinent clinical anatomy and embryological basis for this variation are reviewed, and the possible clinical implications and associated findings are discussed.
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The authors thank Mrs Ana-Mª Alvarez-Castrosín for her assistance with manuscript preparation.
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The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.
Ethical Standard
This study was approved by the Ethical Committee of the Hospital Clínico “San Carlos” of Madrid (12/318-E).
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Arráez-Aybar, L.A., Villar-Martin, A., Poyatos-Ruiperez, C. et al. Prevalence of fenestrated basilar artery with magnetic resonance angiography: a transversal study. Surg Radiol Anat 35, 487–493 (2013). https://doi.org/10.1007/s00276-012-1053-5
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DOI: https://doi.org/10.1007/s00276-012-1053-5