Direct carotid-cavernous fistula completely treated with a small number of coils by combined transarterial and transvenous embolization: A case report.

Background: Endovascular treatment options for direct carotid-cavernous fistula (CCF) include transarterial or transvenous embolization with detachable coils and balloons, parent artery occlusion, or the use of flow-diverting stents across the fistula. Although combined transarterial and transvenous embolization is uncommon, it can be advantageous. We present a case of direct CCF treated successfully with a combined approach using a minimal number of detachable coils.

Case description: A 33-year-old female presented with tinnitus and headache following cesarean delivery and was transferred to our hospital. Cerebral angiography revealed a high-flow shunt from the superior lateral wall of the left cavernous internal carotid artery directly into the cavernous sinus, with a 3.5 × 2.8 mm shunted pouch. A diagnosis of direct CCF was confirmed. To maximize the packing density within the shunted pouch and to manage various situations during embolization, a combined transarterial and transvenous approach was utilized. Complete obliteration of the shunt was achieved without complications using only four detachable coils. The patient was discharged on postoperative day 3 with a modified Rankin Scale score of 0, and there has been no recurrence during the 6-month follow-up.

Conclusion: Direct CCF cases are relatively rare and complex to treat. This case illustrates practical strategies and considerations for achieving complete shunt obliteration with minimal intervention, highlighting the effectiveness of combined transarterial and transvenous embolization.