The authors reported a case of posterior fossa dural AVM (so-called mixed pial-dural AVM). Angiography revealed complicated feeding vessels, which were suspected to be due not only to the occlusion in the transverse venous sinus on one side, but also to marked circulatory disturbance caused by stenosis on the other. This finding suggests that such a case with the nidus in the bilateral venous sinuses would be intractable to surgical intervention alone and might be a good candidate for selective embolization or radiation combined with a surgical procedure.
