Table 3:

Localizations of the aneurysms treated with PED

Localization	No. of Aneurysms	Ratio (%)
Petrous ICA	6	2.4
Cavernous ICAa	28	11.2
Supraclinoid aneurysmb	134	53.4
PcomA aneurysms	21	8.4
AchoA aneurysms	28	11.2
ICA terminal bifurcation	3	1.2
M1	5	2
MCA bifurcation	2	0.8
Basilar arteryc	6	2.4
Vertebral arteryd	8	3.2
Distal aneurysmse	10	4
Total	251	100

Note:—AchoA indicates anterior choroidal artery.

^aIf the aneurysm involved both petrous and cavernous segments, it is included in this group, and this definition applies to 12/28 aneurysms in this group.

^bThe aneurysm is included in the supraclinoid group when it involves this segment, regardless of whether it extends to more than this segment proximally (eg, to the cavernous segment). The aneurysms at the posterior communicating and anterior choroidal artery origins and the terminal bifurcation are shown separately and are not included in this group.

^cThis group includes 1 superior cerebellar artery origin aneurysm and 2 aneurysms involving the vertebrobasilar junction in addition to 3 basilar trunk aneurysms.

^dThree aneurysms at the origin of PICA are included in this group.

^eThis group includes all aneurysms distal to the MCA bifurcation, all anterior cerebral artery aneurysms excluding the ones located at the ICA termination, and any aneurysm distal to basilar termination (ie, posterior cerebral artery aneurysms).