Giant, fusiform, and serpentine aneurysms, particularly those in the posterior circulation, remain a daunting prospect from both the neurosurgical and endovascular standpoints. Patients with those aneurysms continue to have poor long-term prognosis. Endovascular treatment offers a relatively noninvasive means of approaching posterior fossa aneurysms. However, few reports on endovascular occlusion of the giant BA aneurysms with BA occlusion are published 1).