Table 2. Comparison between MCA aneurysms treated by coil embolization and those treated by surgical clipping.

	Coil embolization			Clipping
	Unruptured	Ruptured	Total	Unruptured	Ruptured	Total
Number of cases	22	4	26	49	12	61
Age*	68.0 ± 12.0	55.0 ± 3.7	66.0 ± 12.1	62.3 ± 12.7	63.3 ± 15.0	62.5 ± 13.1
Sex (proportion of females)	77.3%	25.0%	69.2%	67.3%	66.7%	67.2%
Aneurysm size (mm)*	4.57 ± 1.93	14.4 ± 11.3	6.08 ± 5.61	5.03 ± 2.15	6.48 ± 2.88	5.32 ± 2.37
Dome/neck ratio*	1.33 ± 0.29	3.85 ± 4.34	1.71 ± 1.79	1.46 ± 0.57	1.50 ± 0.43	1.47 ± 0.54
Proportion of cases with bleb	59.0%	50.0%	57.7%	48.9%	66.7%	52.5%
Proportion of cases with M2 incorporation	27.8%	50.0%	31.8%	42.9%	50.0%	44.3%

*Mean ± 1 SD. MCA: middle cerebral artery.