Background
Basilar artery aneurysms pose considerable challenges due to their location near vital neurovascular structures. Management becomes more complex with coexisting vertebral artery hypoplasia and intimal hyperplasia (IH)—a response to endovascular intervention marked by smooth muscle proliferation that can lead to stenosis, especially after flow-diverter stent (FDS) placement. This case describes endovascular treatment of a ruptured basilar artery aneurysm complicated by vertebral artery hypoplasia and post-stent IH.
Case presentation
A 38-year-old man presented with severe headache, altered consciousness, and subarachnoid hemorrhage. Imaging revealed a ruptured basilar artery aneurysm and right vertebral artery hypoplasia. An external ventricular drain was placed for hydrocephalus. The aneurysm was treated with coiling and FDS placement via the left vertebral artery to maintain flow and induce aneurysm thrombosis. Post-procedure imaging showed proximal IH without significant flow limitation. The patient was managed with dual antiplatelet therapy. Follow-up demonstrated stable IH, no stenosis, and no aneurysm recurrence.
Conclusion
This case highlights the complexity of managing basilar artery aneurysms in the setting of vertebral artery hypoplasia and IH. Successful treatment depends on meticulous endovascular planning, careful assessment of vascular anatomy, and sustained follow-up. Dual antiplatelet therapy played a key role in preventing IH progression and ensuring a favorable outcome.
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