Parent vessel flow preservation
Only the aneurysmal sac is filled with the embolic material
No parent vessel flow preservation
Trapping (sandwich, isolation, and front-to-back-door techniques): with or without sac packing
Embolic materials (coils or plugs) are deployed distally and proximally to the aneurysmal neck to isolate the lesion and to prevent retrograde filling from the collaterals. The outflow artery ‘the back door’ is closed first, followed by inflow artery ‘the front door’.
Occlusion proximal to the aneurysmal neck. It was done when there was no other option to treat the lesion and when angiography confirmed no visible back doors in cases managed by this technique.