MATERIAL and METHODS: The clinical data were from 327 cases. 304 cases of the surgical group were further assigned to early surgery (89 cases), intermediate surgery(164 cases) and delayed surgery(51 cases) according to the surgical timing. The other 23 cases were the nonsurgical group. The ultimate outcome of all cases was graded according to the Glasgow Outcome Scale. After the cases of the no-surgical group were re-assigned to different surgical subgroups according to the rebleeding time, the ultimate outcome was graded once more.

RESULTS: There was no significant difference among the 3 groups’ pre-operative clinical data. After re-assigning the cases of no-surgical group to the different surgical subgroups, there was no significant difference among the 3 groups’ preooperative clinical data, while the ultimate outcome grades of early surgery (3.6±1.8) and intermediate surgery (3.5±2.2) were superior to that of delayed surgery (2.9±2.8).

CONCLUSION: This retrospective study has demonstrated that early surgery can not only prevent re-rupture of aneurysm to decrease mortality rate but also improve the ultimate outcome. Keywords : Intracranial aneurysm, Subarachnoid hemorrhage, Early surgery, Outcome