Under what circumstances would you use onyx rather than coils to treat a ruptured aneurysm?

Onyx is rarely used for the typical ruptured saccular aneurysm, given the range of excellent endovascular alternatives: coils, flow diverters, and intrasaccular flow disruptors such as the WEB device. Its current role is as a liquid embolic for vessel sacrifice in complex fusiform or dissecting aneu...