Table 3:

Localizations of the aneurysms treated with PED

LocalizationNo. of AneurysmsRatio (%)
Petrous ICA62.4
Cavernous ICAa2811.2
Supraclinoid aneurysmb13453.4
PcomA aneurysms218.4
AchoA aneurysms2811.2
ICA terminal bifurcation31.2
MCA bifurcation20.8
Basilar arteryc62.4
Vertebral arteryd83.2
Distal aneurysmse104
  • Note:—AchoA indicates anterior choroidal artery.

  • a If 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.

  • b The 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.

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

  • d Three aneurysms at the origin of PICA are included in this group.

  • e This 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).