Fig 3.

Exemplary embolization procedure. Note the exemplary embolization procedure shown for group Onyx_60s. Eight injections were performed. For 4 injections, embolization of draining veins (white arrows) and, for 4 injections, reflux (black arrows) were the reasons for injection stop. After the eighth injection, the reflux distance exceeded 1.5 cm and the procedure was terminated. After termination, reflux distance and distance of the embolized draining veins were measured (white double arrows injection [Inj.] No. 8) and the filled sections of the artificial nidus were assessed (according to Fig 2).