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Parameters A to D are important for assessing the feasibility of the contralateral approach to ICA-ophthalmic segment aneurysms, and Parameters E and F are most useful for calculating the difficulty of this approach.

Background:Distal anterior cerebral artery (DACA) aneurysms are rare and their surgical treatment presents some unique difficulties. In this report, we present our experience of cases with DACA aneurysms.Materials and Methods:Among 80 patents with cerebral aneurysm operated on in the three-year period, 15 patients (18.75%) had DACA aneurysms, who were studied retrospectively. We analyze the specific clinical and radiological features, surgical strategies and prognostic factors affecting the surgical outcomes of these DACA aneurysms.Results:There were 10 male and 5 female patients harboring 16 DACA aneurysms. All patients presented with subarachnoid hemorrhage, 11 patients (73%) had intracerebral hematoma in their initial CT scan and four of them had associated intraventricular hemorrhage. Thirteen of the ruptured DACA aneurysms (86%) were small in size (less than 7 mm in diameter). Three patients (20%) had other associate aneurysms. In 14 patients (93%), a unilateral interhemispheric approach was used in their treatment, while pterional approach was used in one patient. Eleven patients (73%) had favorable outcomes and only one patient (7%) died. The follow-up data suggested that poor admission grade and initial Intracerebral hematoma (ICH) on brain scan portend an unfavorable prognosis.Conclusions:DACA aneurysms are usually small even when ruptured, they are usually associated with ICH more frequently than intracranial aneurysms in other locations. They should be aggressively treated even if very small because of their tendency to early rupture.