E-004 Cranial dural arteriovenous fistulas: asymptomatic cortical venous drainage portends less aggressive clinical course. - Strom, R; Botros, J; Refai, D; Moran, C; Cross, D; Grubb, R; Chicoine, M; Rich, K; Dacey, R; Zipfel, G; Derdeyn, C (Journal of NeuroInterventional Surgery, 2010)