Objective:To investigate the endovascular treatment of paraclinoid micro aneurysms(diameter≤3 mm)and the related factors which influence the efficacy. Methods:The clinical data of 34 paraclinoid micro aneurysms in 31 patients who received endovascular therapy between June 2011 and October 2014 were reviewed retrospectively

including the efficacy of treatment

complications

and follow-up results

et al. Results:All patients were successfully embolized

28 patients(90.3%) received stent assisted soil embolization

while 3 patients(9.7%)received simple coil embolization. Angiography after embolization operation showed that 30 patients(96.8%)received complete embolization

while 1 patient(3.2%)received subtotal embolization. All patients were followed-up by outpatient service or telephone for 3-38 months after discharge;29 patients recovered well with no or mild neurological dysfunction

one patient was severely disabled

and 1 patient died;25 patients received follow-up digital subtraction angiography at 6-24 months post-discharge. Follow-up digital subtraction angiography(DSA)showed no recurrence of the aneurysm. Conclusion:Endovascular treatment of paraclinoid micro aneurysms is an effective method

but larger sample research and long-term clinical follow-up are still needed.