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A large nidus with prominent flow voids in the left basal ganglia is demmonstrated. The nidus extends into the left lateral ventricle. There is high signal within and around the nidus which probably represents gliosis. There are enlarged deep cerebral veins. This AVM is Spetzler grade 5 (3 for large nidus, 1 for deep venous drainage, and 1 for nidus situated in eloquent brain).