Endovascular treatment of cerebellar arteriovenous malformations: management of associated aneurysms first or later.

The purpose of this study was to determine the safety and effectiveness of cerebellar arteriovenous malformations (AVMs) embolization and find out the suitable methods to manage associated aneurysms. Medical records of all patients between 1997 and 2014 with a diagnosis of cerebellar AVMs were retrospectively reviewed. Univariable and multivariable logistic analysis were used to assess AVMs characteristics to calculate for the risk of hemorrhage. Endovascular treatment was the main treatment measure to manage the AVMs and associated aneurysms. Of 142 patients, 115 (81.0 %) presented with hemorrhage and 42 (29.6 %) with associated aneurysms. A significant association with cerebellar AVMs hemorrhage was found for small size, prenidal aneurysms, and deep venous drainage in the univariable and multivariable analysis. Associated aneurysms were treated firstly in 41 patients except for 1 patient with 2 prenidal and 2 intranidal aneurysms. The special case was dealt with AVMs and 2 intranidal aneurysms first and angiography showed that the 2 prenidal associated aneurysms disappeared with time. Hemorrhage appeared in 13/142 patients (9.2 %) during the follow-up period, none of which was with associated aneurysms. Endovascular treatment can be a feasible way for treating cerebellar AVMs. Intranidal associated aneurysms should be treated first. Prenidal associated aneurysms can be treated later depending on the angioarchitecture of AVMs.