Endovascular Therapy of 500 Small Asymptomatic Unruptured Intracranial Aneurysms

Article Figures & Data

Table 1:

Characteristics of patients and aneurysms

Characteristics	Data	%
No. of patients	457
Women	333	(72.9)
No. of aneurysms	500
No. of patients with multiple aneurysms endovascularly treated	36	(7.9)
Age (yr)
Mean	59.9 ± 10.5
Median	61.0
Range	19–89
Aneurysm detection
Radiologic examinations for various reasons unrelated to aneurysms	465	(93.0)
Associated with ruptured aneurysms	35	(7)

Table 2:

Aneurysm locations

Note:—PCA indicates posterior cerebral artery; SCA, superior cerebellar artery.

Table 3:

Aneurysm characteristics

Table 4:

Characteristics of 19 aneurysms with technically failed treatment

Table 5:

Immediate angiographic outcomes according to aneurysm characteristics

Table 6:

Immediate angiographic outcomes according to endovascular techniques

Table 7:

Immediate and final anatomic outcomes according to the types of coils used

Outcome	Bare Coil (n = 339)		Biologically Modified Coils (n = 88)
Outcome	No.	%	No.	%
Immediate
CO	225	(66.4)	49	(55.7)
RN	49	(14.5)	19	(21.6)
RA	65	(19.2)	20	(22.7)
Final
CO	233	(68.7)	61	(69.3)
RN	50	(14.7)	17	(19.3)
RA	56	(16.5)	10	(11.4)

Table 8:

Anatomic follow-up outcomes according to aneurysm characteristics

Characteristics	Unchanged		Minor Recurrence		Major Recurrence		Improved
Characteristics	No.	%	No.	%	No.	%	No.	%
Overall (N = 427)	272	(63.7)	29	(6.8)	43	(10.1)	83	(19.4)
Aneurysms measuring <5 mm (n = 187)	123	(65.8)	7	(3.7)	9	(4.8)	48	(25.7)
Aneurysms measuring ≥5 mm (n = 240)	149	(62.1)	22	(9.2)	34	(14.2)	35	(14.6)
D/N ratio <1.5 (n = 117)	56	(47.9)	10	(8.5)	18	(15.4)	33	(28.2)
D/N ratio ≥1.5 (n = 310)	216	(69.7)	19	(6.1)	25	(8.1)	50	(16.1)

Table 9:

Anatomic follow-up outcomes according to endovascular techniques

Technique	Unchanged		Minor Recurrence		Major Recurrence		Improved
Technique	No.	%	No.	%	No.	%	No.	%
Simple (n = 168)	121	(72.0)	6	(3.6)	13	(7.7)	28	(16.7)
Balloon-assisted (n = 222)	139	(62.6)	19	(8.6)	21	(9.5)	43	(19.4)
Double-catheter (n = 37)	12	(32.4)	4	(10.8)	9	(24.3)	12	(32.4)

Table 10:

Ischemic and hemorrhagic complications according to aneurysm characteristics and endovascular techniques