Table 1.
Indications of a supraorbital keyhole approach for anterior circulation aneurysms according to the aneurysm location
| Aneurysm location | Favorable indications | Unfavorable or less favorable indications |
|---|---|---|
| ICA | • PCoA aneurysm | • ICA posterior wall aneurysm |
| • AChA aneurysm | • Low-lying supraclinoid ICA aneurysm | |
| • ICA bifurcation aneurysm | • Paraclinoid ICA aneurysm | |
| • ICA superior wall aneurysm | ||
| ACA | • A1 segment aneurysm | • Superior-directing ACoA aneurysm |
| • Inferior- or anterior-directing ACoA aneurysm | • High-positioned ACoA | |
| • Low-positioned ACoA aneurysm | • Pericallosal artery aneurysm | |
| MCA | • M1 segment aneurysm | • Aneurysm distal to MCA genu |
| • MCA bifurcation aneurysm |
ICA : internal carotid artery, PCoA : posterior communicating artery, AChA : anterior choroidal artery, ACA : anterior cerebral artery, ACoA : anterior communicating artery, MCA : middle cerebral artery