Comment On: Curative Embolization of Brain Arteriovenous Malformations with Onyx: Patient Selection, Embolization Technique, and Results: van Rooij WJ, Jacobs S, Sluzewski M, van der Pol B, Beute GN, Sprengers ME. AJNR Am J Neuroradiol. 2012 Mar 1. [Epub ahead of print]