[Incidentally-discovered aneurysm--a report of eight cases (author's transl)]

There have been only a few reports of asymptomatic aneurysm clinically treated up to the present. The authors incidentally found eight cases of intracranial aneurysm: five cases with brain tumor, one with brain abscess and the remaining three with head injury. It may be considered that the careful observation of angiograms could reveal more asymptomatic aneurysms. The ideal treatment of aneurysm should be direct operation before rupture. But it is difficult to find out them before the onset of signs and symptoms of subarachnoid hemorrhage or cranial nerve involvement. The only chance of finding asymptomatic aneurysm is brought about by paying special attention to aneurysm even in angiography for other intracranial diseases such as tumors, head injuries, vascular diseases and so on. It was thus concluded that incidentally-discovered aneurysm should be directly treated if the prognosis of the original disease is thought to be good. The authors operated on four aneurysms of three patients and operative result was excellent.