A and B, Right parieto-occipital AVM shown in T2-weighted MRIs with flow voids consistent with AVM (arrows). C, T1-weighted MRI with contrast that partially enhances the parieto-occipital AVM (arrow). D and E, Anteroposterior and lateral arteriograms with vertebral injection show posterior cerebral artery feeders (small arrows) to the AVM (large arrows), with a large draining vein into the superior sagittal sinus (curved arrows). Reprinted with permission from Mayo Clinic Proceedings. 2005;80:269-281.