Abstract
Although the surgical treatment of an unruptured intracranial aneurysm (AN) has become an accepted procedure, the surgical treatment of an unruptured arteriovenous malformation (AVM) still remains a subject of controversy, and the authors herein report the case of an unruptured AN that was accompanied by an AVM of the posterior fossa. The patient, a 68-year-old woman, had tinnitus, and the CT and MRI findings suggested an AVM. Angiography revealed this AVM, which was accompanied by AN. The major feeding artery was found to be the inferior vermian branch of the right posterior inferior cerebellar artery, from which a berry AN was arising. Both lesion thus were treated by a one-stage operation, and the results have been satisfactory. Based on this experience and a study of pertinent eases in the literature, the authors have concluded that patients with both an unruptured AVM and an unruptured AN of the posterior fossa, as well as patients with hemorrhaging from an AVM or AN should be individually evaluated for possible treatment by surgery.
