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Table 1: Angiographic characteristics of the WEB 17-treated aneurysms
No. Neck (Median) (mm) Dome (Median) (mm) DN-Ratio
Total 47 100% 2.0 3.0 1.5
Anterior circulation 38 80.9% 2.0 3.0 1.5
 ICA PcomA 19 40.3% 2.0 4.0 1.5
 ACA A2 13 27.7% 2.0 3.0 1.0
 MCA M1 2 4.3% 2.5 2.0 0.8
 ICA o 2 4.3% 2.5 3.5 1.3
 ICA choroid 2 4.3% 2.5 4.5 1.8
Posterior circulation 9 19.1% 3.0 3.0 1.0
 PCA P2 2 4.3% 2.0 4.0 1.3
 PICA 3 6.4% 2.0 3.0 1.0
 SUCA 4 8.4% 2.5 3.5 1.2
Note:—PCA indicates posterior cerebral artery; ICA o, paraophthalmic segment of the ICA; SUCA, superior cerebellar artery; DN-Ratio, dome-to-neck ratio.

	No.		Neck (Median) (mm)	Dome (Median) (mm)	DN-Ratio
Total	47	100%	2.0	3.0	1.5
Anterior circulation	38	80.9%	2.0	3.0	1.5
ICA PcomA	19	40.3%	2.0	4.0	1.5
ACA A2	13	27.7%	2.0	3.0	1.0
MCA M1	2	4.3%	2.5	2.0	0.8
ICA o	2	4.3%	2.5	3.5	1.3
ICA choroid	2	4.3%	2.5	4.5	1.8
Posterior circulation	9	19.1%	3.0	3.0	1.0
PCA P2	2	4.3%	2.0	4.0	1.3
PICA	3	6.4%	2.0	3.0	1.0
SUCA	4	8.4%	2.5	3.5	1.2