Observational StudyTARGET Intracranial Aneurysm Coiling Registry

Inclusion Criteria:

1. Patient is 18 years or older.
2. Patient has a documented, previously untreated, saccular intracranial aneurysm, unruptured or ruptured, suitable for embolization with coils.
3. (NEW NANO arm ONLY) Target aneurysm is ≤7mm.
4. Patient has a Hunt and Hess Score of 3 or less.
5. Patient has a premorbid mRS of 3 or less.
6. Patient or patient's legally authorized representative has provided written informed consent.
7. Patient is willing to and can comply with study follow-up requirements.

Exclusion Criteria:

1. Patient is < 18 years old.
2. Dissecting aneurysm.
3. Patients with intracranial aneurysms (other than the target aneurysm) that will require treatment during the study period (enrollment through follow-up).
4. Patients in whom the target aneurysm will be treated with coils other than Stryker Target® 360°, Target® Helical coils, and 2nd generation Target® Nano Coils.
5. (NEW NANO Arm ONLY) Patients in whom the target aneurysm was treated with a total coil length comprised of <25% Stryker Target® 2nd generation Nano Coils.
6. Target aneurysm is fusiform.
7. Patients in which the target aneurysm cannot be coiled in one procedure (i.e. staged procedure)