Published Online
on December 5, 2002

A more recent version of this article appeared on January 1, 2003

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Submitted on July 30, 2002
Accepted on August 1, 2002

Incidence and Outcome of Multiple Intracranial Aneurysms in a Defined Population

Makio Kaminogo MD^*; Masahiro Yonekura MD; and Shobu Shibata MD

From the Department of Neurosurgery, Nagasaki University School of Medicine (M.K., S.S.), and Department of Neurosurgery, National Nagasaki Medical Center (M.Y.), Nagasaki, Japan.

^* To whom correspondence should be addressed. E-mail: kaminogo{at}net.nagasaki-u.ac.jp.

Background and Purpose—Proportions of patients with single and multiple aneurysms among patients suffering from subarachnoid hemorrhage (SAH) are not well established. We evaluated these proportions and the differences in outcome between SAH patients with a single aneurysm and those with multiple aneurysms in a defined population.

Methods—Between 1989 and 1998, 2037 patients (age, 20 to 89 years) with ruptured intracranial aneurysm were treated in 11 hospitals in Nagasaki Prefecture. Multiple aneurysms were found in 361 of these patients. Age- and sex-specific incidences of ruptured aneurysm per 100 000 people were calculated.

Results—For both single and multiple aneurysms, the incidences were significantly higher in women than in men 60 to 69 and 70 to 79 years of age. In every age category except 80 to 89 years, the frequency of multiple aneurysms was higher in women than in men. The overall frequency of multiple aneurysms was 20.2% in women, which was significantly higher than the 12.4% in men (P<0.0001). In patients 70 to 89 years of age, outcome was significantly worse (in terms of surgical complications) in patients with multiple aneurysms (12.1%) than in patients with a single aneurysm (6.0%).

Conclusions—Among all patients with SAH, women 50 years of age outnumber other age and sex categories. Female sex itself is also associated with an increased rate of multiple aneurysms among SAH patients. Among the elderly 70 years of age, prognosis is less favorable for SAH patients with multiple aneurysms than for those with a single aneurysm.

Key words: aneurysm • epidemiology • outcome • subarachnoid hemorrhage

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