Transarterial Embolization via the Occipital Artery for a Posterior Condylar Canal Dural Arteriovenous Fistula Following Head Trauma

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Posterior condylar canal dural arteriovenous fistula is rare, and cases of posterior condylar canal dural arteriovenous fistula directly related to trauma have been reported even less frequently. We describe a case of posterior condylar canal dural arteriovenous fistula that presented with tinnitus soon after head trauma and was successfully treated with transarterial embolization. A 60-year-old man presented with right-sided tinnitus that had persisted for 2 weeks after sustaining a right temporal injury. Digital subtraction angiography revealed a posterior condylar canal dural arteriovenous fistula with venous drainage from the posterior condylar vein to the suboccipital cavernous sinus, without cortical venous reflux. The shunt was supplied by a single feeder, the jugular branch of the occipital artery. Transarterial embolization using N-butyl cyanoacrylate and coils achieved complete occlusion of the shunt. The patient's tinnitus resolved immediately after the procedure, and follow-up angiography demonstrated persistent complete occlusion of the fistula, with no evidence of recurrence. Posterior condylar canal dural arteriovenous fistula is a rare lesion that may occur following head trauma. Bone-window three-dimensional angiographic reconstruction is useful for diagnosis, as it clearly delineates the relationship between the skull base canal and the shunt. Transarterial embolization can be a curative treatment option when performed with a thorough understanding of the relevant vascular anatomy and potentially hazardous anastomoses.

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