A useful side-hole on a guiding catheter for transvenous embolization of a transverse-sigmoid sinus dural arteriovenous fistula.

A side-hole on a guiding catheter was found to be useful for the navigation of a microcatheter to override a reversed Y-shaped confluence in transvenous embolization of TSS DAVF. This technique could be applicable to difficult configurations for transvenous catheterization, although attention should be paid to disruption of the catheter.