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The authors retrospectively reviewed a nationwide surveillance to identify risk factors contributing to complications and short-term clinical outcomes in the endovascular treatment of brain arteriovenous malformations. A total of 1042 endovascular procedures (788 patients) performed in 111 institutions from 2010 to 2014 were reviewed. Univariate analysis identified deep venous drainage, associated aneurysms, infratentorial location, and pre-radiosurgical embolization as statistically significant risk factors for complications. Multivariate analysis showed that embolization of brain arteriovenous malformations in the infratentorial location was significantly associated with complications.