Christoforidis GA, Mohammad Y, Avutu B, Tejada A, Slivka AP. Arteriographic demonstration of slow antegrade opacification distal to a cerebrovascular thromboembolic occlusion site as a favorable indicator for intra-arterial thrombolysis. AJNR Am J Neuroradiol. 2006 Aug; 27(7):1528-31.