Persistent primitive trigeminal artery cavernous sinus fistula coexisting with left vertebral artery dissecting aneurysm: A case report.

A 41-years-old woman presented with left-sided headache, diplopia, and ptosis of the left eyelid. Cerebral computed tomography angiography revealed a left persistent primitive trigeminal artery cavernous sinus fistula and a dissecting aneurysm in the V4 segment of the left vertebral artery. Digital subtraction angiography confirmed the diagnosis. The fistula was successfully occluded using dual-microcatheter coil embolization combined with Onyx-18 injection, assisted by balloon protection of the internal carotid artery. The vertebral artery dissecting aneurysm was managed conservatively by administering dual antiplatelet therapy (aspirin (100 mg/day) and clopidogrel (75 mg/day) for 3 months). Follow-up imaging at 11 months demonstrated complete resolution of the aneurysm.