Broad-based intracranial aneurysms: thrombosis induced by stent placement.

For broad-based intracranial aneurysms, both surgical and endovascular treatments are demanding. Flexible metallic stents provide an alternative treatment option for these patients, because they enable coil placement through the stent mesh. Evidence from extracranial arteries indicates that aneurysms may also spontaneously thrombose after stent placement. This case report documents three patients with saccular intracranial aneurysms in whom aneurysm thrombosis occurred after stent placement only, without additional packing of the aneurysms with coils.