Detachable coil embolization was performed on 34 non-ruptured cerebral aneurysms in 33 patients. Patients consisted of 28 females and five males, with an age range of 26 to 77 years. Angiographic examination after coil embolization revealed complete or near-complete occlusion in 24 aneurysms (70.5%) and partial occlusion in three (8.8%). Detachable coil embolization was attempted unsuccessfully in seven aneurysms (20.5%). Transient ischemic attack occurred in one case with coil migration. The combined mortality/morbidity rate was 0%.