Abstract:Objective To explore the safety and efficacy of endovascular treatment of Nano coil embolization for anterior choroidal artery(AChA) micro-aneurysms. Methods A total of 983 patients with aneurysms who underwent endovascular treatment from June 2017 to June 2019 were selected, of which 15 patients with AChA micro-aneurysms suitable for inclusion after image evaluation,and the 15 patients clinical data (stability of intraoperative coil, incidence of AChA ischemia, degree of intraoperative aneurysm embolization, mRS score at discharge and GOS score after 3 months of follow-up) were analyzed retrospectively. Results Raymond grade I embolization of aneurysms was achieved in 11 patients (11/15), Raymond grade Ⅱ embolization of aneurysms was achieved in 4 patients (4/15), without AChA occlusion occurring during operation. The limb muscle strength reduced after operation in 2 cases (2/15) and recovered completely. No bleeding due to rupture occurred during or after operation. At discharge, the mRS score was 0 in 13 cases (13/15) and 1 in 2 cases (2/15). At 3 month of follow-up, there was no recurrent ischemia and bleeding, and GOS scores were 5 points in 14 patients. One patient was lost to follow up. Conclusion Endovascular treatment of AChA micro-aneurysms with Nano coil is safe, reliable and stable.