Table 1:

Aneurysm characteristics

Aneurysm Characteristics	Anterior ICA ≥10 mm (n = 311)	Anterior <10 mm (n = 349)	Posterior (n = 59)	Other Anterior ≥10 mm (n = 178)	Total (n = 896)^{^a}	P Value
Aneurysm size (mm)
Mean ± SD	16.8 ± 6.2	5.2 ± 2.2	14.5 ± 9.0	9.8 ± 7.9	10.7 ± 7.7	<.001
Median, range	15.0, 10.0–42.0	5.0, 1.0–9.9	11.8, 1.7–45.0	7.2, 1.0–55.0	9.0, 1.0–55.0
Aneurysm type
Small	0	349/349 (100%)	19/58 (32.8%)	105/178 (59.0%)	473/897 (52.8%)
Large	268/311 (86.2%)	0	29/58 (50.0%)	60/178 (33.7%)	357/897 (39.8%)
Giant	43/311 (13.8%)	0	10/58 (17.2%)	13/178 (7.3%)	66/897 (7.3%)
Aneurysm neck (mm)
Mean ± SD	8.5 ± 5.1	4.1 ± 2.2	9.3 ± 8.4	5.3 ± 5.1	6.2 + 4.9	<.001
Median, range	7.6, 0.9–50.0	4.0, 0.8–22.0	8.0, 1.7–53.0	4.0, 1.0–50.0	5.0, 0.8–53.0
Aneurysm shape
Fusiform	49/311 (15.8%)	17/349 (4.9%)	17/59 (28.8%)	29/178 (16.3%)	112/897 (12.5%)	<.001
Saccular	239/311 (76.9%)	305/349 (87.4%)	25/59 (42.4%)	118/178 (66.3%)	686/897 (76.5%)
Dissecting	10/311 (3.2%)	8/349 (2.3%)	13/59 (22.0%)	22/178 (12.4%)	53/897 (5.9%)
Other	13/311 (4.2%)	19/349 (5.4%)	4/59 (6.8%)	9/178 (5.1%)	46/897 (5.1%)
Aneurysm location
Internal carotid artery	311/311 (100%)	349/349 (100%)	0	0	660/897 (73.6%)	<.001
Middle cerebral artery	0	0	0	43/178 (24.2%)	43/897 (4.8%)
Posterior cerebral artery	0	0	15/59 (25.4%)	0	15/897 (1.7%)
Basilar artery	0	0	44/59 (74.6%)	0	44/897 (4.9%)
Other	0	0	0	135/178 (75.8%)	135/897 (15.1%)
Presented with ruptured aneurysm	12/311 (3.9%)	24/345 (7.0%)	4/59 (6.8%)	34/176 (19.3%)	74/891 (8.2%)	<.001
Multiple PEDs used	143/311 (46.0%)	97/347 (28.0%)	19/59 (32.2%)	47/178 (26.4%)	306/895 (34.2%)	<.001