TARGET 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)