title: [Angiographical frequency of unruptured incidental intracranial aneurysms].
abstract: We reviewed cerebral angiograms studied between May 1985 and December 1992 focusing on unruptured incidental intracranial aneurysms. In a total of 605 cases of cerebral angiograms except for patients with SAH, 43 patients (7.1%) were found to have unruptured aneurysms. In the 72 patients with headache, 11 patients (15.3%) were found to have unruptured aneurysms. This high frequency of unruptured aneurysms in headache patients is significant as a factor showing that headache may be due to unruptured aneurysms. The result of this observation is that as a screening study for headache patients, cerebral angiography may be required in spite of the invasive and high-risk method. But we think that MR angiography is, at present, a useful screening study only for detecting cerebral aneurysms with a diameter of over 5mm, and which are considered to need an operation.
authors.affiliation: Department of Radiology, Yamagata Prefectural Shinjo Hospital, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Sugai
authors.forename: Y
authors.initials: Y
authors.lastname: Hamamoto
authors.forename: T
authors.initials: T
authors.lastname: Ookubo
authors.forename: K
authors.initials: K
authors.lastname: So
mesh_terms: D000367:Age Factors; D002533:Cerebral Angiography; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D012737:Sex Factors