1. Patient has more than one aneurysm requiring treatment in the current treatment session, and only one of those to be treated aneurysms fits the current Study inclusion criteria (i.e. if either (1) a patient has multiple aneurysms, but only one will be treated at enrollment; or (2) if two or more aneurysms are treated during the current treatment session and BOTH are able to be enrolled, then they remain eligible for the Study). Non-treated additional aneurysms may be treated after 30 days from the incident procedure with any coil type that the operator chooses, and, if eligible, those aneurysms may also be enrolled as an additional enrollment.