Fig 1.

Sample case of a DAVF without angioarchitectural features with a negative influence on the treatment success. A DAVF with direct cortical venous drainage (Cognard type III), located at the tentorium in a 65-year-old man with headaches (A). Involved feeding arteries are the middle meningeal artery (black arrows in A) and the occipital artery (white arrows in A), which shunt directly into a cortical vein (white arrowheads). There were <10 feeding arteries, and the ascending pharyngeal artery was not involved. The DAVF could be occluded completely by transarterial embolization with Onyx (B). DSA 6 months after embolization shows stable occlusion of the DAVF (C).