Isolated hypoglossal nerve palsy due to endovascular treatment of a dural arteriovenous fistula with Onyx-18.

We describe a patient with dural arteriovenous fistula (DAVF) treated with Onyx-18 who developed isolated hypoglossal nerve palsy. This is the first case of isolated hypoglossal nerve palsy caused by Onyx-18 embolization. This complication suggests that over embolization with On- yx-18 in the treatment of hypoglossal canal DAVFs should be avoided, and transvenous em- bolization may be safer. Furthermore, pred- nisolone therapy should be carried out in the prophase of nerve palsy.