Ruptured vertebrobasilar junction aneurysm coexisting with isolated interrupted aortic arch and basilar artery hypoplasia in an adult female: illustrative case

In adults or adolescents with aneurysmal SAH, IAA typically manifests as an isolated anomaly pathologically linked to prenatal development of robust compensatory collateral circulation supplying the descending aorta. This case demonstrates a synergistic pathogenesis involving two critical hemodynamic factors: proximal basilar artery occlusion combined with type B aortic arch discontinuity, collectively promoting VBJ aneurysm formation. Transradial endovascular intervention proved safe and effective in this anatomically complex scenario. https://thejns.org/doi/10.3171/CASE25421.