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TABLE 1: Characteristics of patient population
Number of Patients (%)
Age
 <40 yr 32 (14.7)
 40–69 yr 149 (68.7)
 ≥70 yr 36 (16.6)
 Mean 54.2 yr 
 Range 13–83 yr
Sex 
 Female 167 (77)
 Male 50 (23)
Classification 
 Group 1, incidental 118 (54.4)
 Group 2, mass effect 51 (23.5)
 Group 3, tumor/AVM 12 (5.5)
 Group 4, chronic SAH 17 (7.8)
 Group 5, acute SAH 19 (8.8)
  Grade I 4
  Grade II 9
  Grade III 5
  Grade IV 1
  Grade V 0
Indication for endovascular treatment 
 Surgically difficult 68 (31.3)
 Failed clipping 17 (7.8)
 Refusal of surgery 37 (17.1)
 Elderly plus poor medical condition 54 (24.9)
 Information not available 41 (18.9)
Note.—AVM indicates arteriovenous malformation; SAH, subarachnoid hemorrhage.

	Number of Patients (%)
Age
<40 yr	32 (14.7)
40–69 yr	149 (68.7)
≥70 yr	36 (16.6)
Mean	54.2 yr
Range	13–83 yr

Sex
Female	167 (77)
Male	50 (23)

Classification
Group 1, incidental	118 (54.4)
Group 2, mass effect	51 (23.5)
Group 3, tumor/AVM	12 (5.5)
Group 4, chronic SAH	17 (7.8)
Group 5, acute SAH	19 (8.8)
Grade I	4
Grade II	9
Grade III	5
Grade IV	1
Grade V	0

Indication for endovascular treatment
Surgically difficult	68 (31.3)
Failed clipping	17 (7.8)
Refusal of surgery	37 (17.1)
Elderly plus poor medical condition	54 (24.9)
Information not available	41 (18.9)