• N Yasui, S Magarisawa, A Suzuki, H Nishimura, T Okudera, and T Abe.
• Department of Surgical Neurology, Research Institute for Brain and Blood Vessels-Akita, Japan.
• Neurosurgery. 1996 Dec 1; 39 (6): 1096-100; discussion 1100-1.

ObjectiveWe conducted a retrospective analysis of the clinical features of angiographically diagnosed unruptured intracranial aneurysms that were treated conservatively and subsequently ruptured.MethodsAt our center, we reviewed the angiographic and clinical features of 25 patients with subarachnoid hemorrhage caused by previously unruptured aneurysms.ResultsEleven of the 25 patients died, including 1 patient who had undergone surgery. Ten patients had single aneurysms, and 15 had multiple aneurysms. Thus, multiple aneurysms were significantly more common than single aneurysms. The associated disease was cerebral infarction in 12 patients, previous subarachnoid hemorrhage from different aneurysm in 8 patients, intracerebral hemorrhage in 3 patients, and other conditions in 2 patients. Aneurysm size was able to be evaluated after rupture in 20 patients. At initial diagnosis, 16 aneurysms measured less than 5 mm in maximum diameter; the size of most aneurysms had increased by the time of rupture, although the aneurysm size remained less than 5 mm in five patients. No relationship was found between aneurysm rupture and patient age, aneurysm size at initial diagnosis, or time interval from diagnosis to rupture. The incidence of aneurysm rupture in patients with cerebrovascular disease, although higher than the incidence in patients with other underlying disease, was not significant.ConclusionWe conclude that small unruptured intracranial aneurysms measuring less than 5 mm are susceptible to the risk of rupture, so that radical treatment or careful follow-up examination should be considered.

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