“…For direct puncture of the SOV, various complications, such as puncture-related intraorbital hemorrhage, injury of the levator muscle and supraorbital nerve, orbital infection, granulomas, damage to the trochlear nerve, and nonarteritic ischemic optic neuropathy, have been reported. [ 6 , 17 , 18 ] Moreover, if the SOV is occluded due to SOV injury and retrograde cortical venous drainage occurs, the CSDAVF becomes an aggressive lesion with a risk for intracranial hemorrhage. For these reasons, the transfemoral venous approach is preferred over direct puncture of the STV or the SOV.…”