Whether Intracranial Aneurysm Could Be Well Treated by Flow Diversion: A Comprehensive Meta-Analysis of Large-Sample Studies including Anterior and Posterior Circulation

Table 2

Basic characteristics of aneurysms.

Type		of studies	(%) of aneurysms
Region	North America	14	5210 (70.3%)
	Europe	5	1275 (17.2%)
	Asia	2	471 (6.4%)
	Latin America	2	450 (6.1%)
Center	Single	6	977 (13.2%)
	Multi	17	6429 (86.8%)
Aneurysm
Size (mean, mm)		23	7406
Mean		15	4440 (60.0%)
Mean		8	2966 (40.0%)
Mean		2	564 (7.6%)
Mean		9	3015 (40.7%)
Unknown neck length		12	3827 (51.7%)
Location
Anterior circulation		21	5489 (74.1%)
ICA		4	2169 (29.3%)
Ophthalmic		14	1904 (25.7%)
Cavernous		16	699 (9.4%)
Clinoid		8	466 (6.3%)
MCA		9	191 (2.6%)
ACA/ACoA		4	60 (0.8%)
Posterior circulation		12	461 (6.2%)
Vertebral		5	142 (1.9%)
Basilar		3	133 (1.8%)
PCA/PCoA		7	186 (2.5%)
Unknown/other location		—	1456 (19.7%)
Morphology		15	5085 (68.7%)
Saccular		15	4129 (55.8%)
Fusiform		15	754 (10.2%)
Dissection		8	160 (2.2%)
Blister		5	42 (0.6%)
Unknown morphology		8	2321 (31.3%)

Abbreviations: ACA: anterior cerebral artery; ACoA: anterior communicating artery; ICA: internal carotid artery; MCA: middle cerebral artery; PCA: posterior cerebral artery; PCoA: posterior communicating artery.