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The treatment of intracranial aneurysms with preservation of the parent artery may be per-formed either by open surgical clipping or through an endovascular endosaccular tech-nique (1); however, the endovascular approach has not yet proved to be as effective as surgery. Until recently, the endovascular approach to aneurysmal occlusion has been limited to bal-loon embolization (2), but the development of detachable coils has widened the alternatives for the endovascular therapeutic management of intracranial aneurysms. One recently de-scribed retractable coil system is the Guglielmi detachable coil (GDC; Target Therapeutics, Fremont, Calif) (3). The detachment mecha-nism of the GDC system works by means of an electrical current that induces detachment by electrolysis, which requires varying amounts of time. Another mechanical detachment system, the interlocking detachable coil (IDC) occlusion system (Target Therapeutics), now provides an immediate but still controllable coil detachment mechanism. We describe five intracranial aneu-rysms that were treated by IDCs with midterm angiographic follow-up results. Subjects and Methods Five patients were treated by means of endovascular endosaccular occlusion using IDCs. The IDCs are made of platinum, available in diameters of 2 to 8 mm and in lengths of 40 to 200 mm. The primary helix diameter is 0.015 inch in all coil sizes. Three patients were male (31, 43, and 56 years old, respectively) and two patients were female (4 and 62 years old, respectively). The treated aneurysms were lo-cated at the basilar artery tip in two patients, the posterior inferior cerebellar artery (PICA) in one patient, and the internal carotid artery (ICA) in two patients. Three of the patients with aneurysms of the basilar artery and the PICA had subarachnoid hemorrhage. These patients had no neurologic deficit before the intervention. One of the tw