Endovascular treatment of basilar artery trunk aneurysms

There has been little reported on the endovascular experience of basilar artery (BA) trunk aneurysms due to its low incidence. The purpose of this study is to report the results of endovascular treatment (EVT) of BA trunk aneurysms. Between 2004 and 2008, eight BA trunk aneurysms were treated by EVT. Five patients presented with subarachnoid hemorrhage, one had intracranial mass effect, and in two of the patients the aneurysms were found incidentally. Four lesions were saccular aneurysms, three of them were found with BA fenestration. Three lesions were dissecting aneurysms and one was a giant fusiform aneurysm. The mean follow-up period of clinical outcome was 17.1 months (range, 6-32 months). Angiographic follow-up data was obtained in six patients for period of a mean of 15.6 months (range, 6-25 months). Four patients with saccular aneurysms were treated by stent-assisted coil embolization except for one patient that was treated without a stent. Three patients with dissecting aneurysms were treated by a single stent placement. One of these dissecting aneurysms rebled in 4 days after stent placement and was secured by BA occlusion. One giant fusiform aneurysm was treated by bilateral vertebral artery (VA) occlusion after balloon test occlusion. Six patients (75.0%) had excellent or good clinical outcomes, one patient whose aneurysm rebled became vegetative, and one patient with bilateral VA occlusion died. Follow-up angiograms showed that four lesions had complete occlusion and two had neck remnant. The endovascular catheterization of these lesions tends to be relatively simple compared to more complex neurosurgical approaches. EVT, especially using a stent, could be a valuable therapeutic method in treating BA trunk aneurysms.