We have 32 university hospitals and 18 general hospitals for neurosurgical training in Korea. Recently I have analyzed intracranial aneurysm cases which had an operation in 28 university hospitals and nine general hospitals. I have reported 2863 aneurysm operation cases. The location of aneurysm consisted of 865 aneurysms (30.2%) in the anterior communicating artery, 724 aneurysms (25.3%) in the internal carotid artery, 687 aneurysms (24.0%) in the middle cerebral artery, 129 aneurysms (4.5%) in the anterior cerebral artery, 152 aneurysms (5.3%) in the posterior circulation, and 306 (10.7%) multiple aneurysms. The overall approximation of the operation rate of aneurysm is approximately 6.6 cases per 100,000 population in 1996 in Korea.