“…The cost of Onyx use is lower compared to conventional coiling whether it is used with coiling or as a sole treatment option. 27,32,46,[51][52][53][54] Onyx can be used as a sole agent for embolization in case of low-flow fistulas or with detachable coils as shown in our cases. 25,27,32,52 It can be delivered either transarterially or transvenously; its nonadhesive property eliminates the risk of gluing the microcatheter and can permit prolonged injections with penetration into different areas of the CS as well as the draining vein and branches of other arterial feeders, which cannot be sometimes reached by the standard catheter/ coiling technique.…”