Dural Arteriovenous Fistula Between the Inferolateral Trunk and Cavernous Sinus Draining to Ophthalmic Vein

BACKGROUND: Formation of a dural arteriovenous fistula (DAVF) between the inferolateral trunk (ILT) and cavernous sinus (CS) is rare. CASE DESCRIPTION: This study presents a case of ILT-CS DAVF. A 64-year-old male patient had exophthalmos of the left eye with redness and swelling. Digital subtraction angiography revealed a connection between the ILT and the CS that formed a high-flow DAVF, which was drained only to the ophthalmic vein and no other parts of the CS. The ILT was chosen as the transarterial path for treatment because it was enlarged. The microcatheter was navigated into the ILT, and 2 coils were then used to occlude the ILT. After occlusion of the ILT, no image of the DAVF indicated that the ILT-CS DAVF was completely cured. The patient's symptoms improved gradually after surgery. At the 6-month follow-up visit, digital subtraction angiography showed no sign of ILT-CS DAVF and the patient's eye symptoms had disappeared. CONCLUSIONS: Although ILT-CS DAVF is rare, it can still be seen in clinical practice. Coiling the ILT via a transarterial approach is a good option for treatment.