Aneurysm rupture after parent vessel sacrifice: treatment with Guglielmi detachable coil embolization via retrograde catheterization: case report.

We report a patient with rupture of a giant distal vertebral artery aneurysm after balloon occlusion of the parent vertebral artery. We were able to occlude the residual lumen by endosaccular embolization and trapping with Guglielmi detachable coils via the anterior circulation. We suspect that either alterations in flow patterns or partial thrombosis of the aneurysm may have contributed to at least two subarachnoid hemorrhages within 2 days after the initial embolization.