Annual rupture risk of growing unruptured cerebral aneurysms detected by magnetic resonance angiography.

Abstract:

OBJECT:In this paper, the authors' goals were to clarify the characteristics of growing unruptured cerebral aneurysms detected by serial MR angiography and to establish the recommended follow-up interval. METHODS:A total of 1002 patients with 1325 unruptured cerebral aneurysms were retrospectively identified. These patients had undergone follow-up evaluation at least twice. Aneurysm growth was defined as an increase in maximum aneurysm diameter by 1.5 times or the appearance of a bleb. RESULTS:Aneurysm growth was observed in 18 patients during the period of this study (1.8%/person-year). The annual rupture risk after growth was 18.5%/person-year. The proportion of females among patients with growing aneurysms was significantly larger than those without growing aneurysms (p=0.0281). The aneurysm wall was reddish, thin, and fragile on intraoperative findings. Frequent follow-up examination is recommended to detect aneurysm growth before rupture. CONCLUSIONS:Despite the relatively short period, the annual rupture risk of growing unruptured cerebral aneurysms detected by MR angiography was not as low as previously reported. Surgical or endovascular treatment can be considered if aneurysm growth is detected during the follow-up period.

journal_name

J Neurosurg

journal_title

Journal of neurosurgery

authors

Inoue T,Shimizu H,Fujimura M,Saito A,Tominaga T

doi

10.3171/2012.4.JNS112225

subject

Has Abstract

pub_date

2012-07-01 00:00:00

pages

20-5

issue

1

eissn

0022-3085

issn

1933-0693

journal_volume

117

pub_type

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