Complete Occlusion of Coilable Aneurysms

Inclusion Criteria: * Age 21 to 75 years, inclusive * Patient has a single target IA that: 1. is located in the following regions of the internal carotid artery: i. Paraophthalmic (including paraclinoid, ophthalmic and hypophyseal segments) ii. Cavernous iii. Petrous 2. is saccular 3. has a parent vessel with diameter 2.5-5.0 mm * If target IA has a neck \>4 mm, at least 2 of 3 members of an independent expert committee (IEC) have confirmed that coil embolization with optional adjunctive techniques\*\* has a very high likelihood of procedural success (i.e., coil placement and retention) * Subject has provided written informed consent using the IRB-approved consent form * Subject has the necessary mental capacity to participate and is willing and able to comply with protocol requirements * \*\* Adjunctive techniques include intravascular balloons \["balloon remodeling"\], 3D coils, dual catheter techniques. Exclusion Criteria: * Target IA has BOTH neck \>4 mm AND size (maximum fundus diameter) \>10 mm * More than one IA requires treatment in the next 6 months * Subarachnoid hemorrhage in the past 60 days * Any intracranial hemorrhage in the last 42 days * Major surgery in the last 42 days * Coils in place in the target IA * Unstable neurologic deficit (i.e., any worsening of clinical condition in the last 30 days) * Known irreversible bleeding disorder * Platelet count \< 100 x 103 cells/mm3 or known platelet dysfunction * Inability to tolerate, documented evidence of adverse reaction or contraindication to study medications * Prior stent placement at target site * Contraindication to CT scan AND MRI * Known allergy to contrast used in angiography that cannot be medically controlled * Known severe allergy to platinum or cobalt/chromium alloys * Relative contraindication to angiography (e.g., serum creatinine \> 2.5 mg/dL) * Woman of child-bearing potential who cannot provide a negative pregnancy test * Evidence of active infection at the time of treatment * Other known conditions of the heart, blood, brain or intracranial vessels that carry a high risk of neurologic events (e.g., severe heart failure, atrial fibrillation, known carotid stenosis) * Current use of cocaine or other illicit substance * Any comorbid disease or condition expected to compromise survival or ability to complete follow-up assessments to 180 days * Extracranial stenosis greater than 50% in the carotid artery * Intracranial stenosis greater than 50% in the treated vessel