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Left posterior frontal AVM. A, The DSA examination demonstrates a small deep medullary vein (arrows), which drains into the straight sinus. The AVM nidus was in close proximity to the Broca area and was scored as Spetzler-Martin grade III. B, Coronal HYPRFlow late arterial phase image with poor delineation of the deep medullary vein (arrows), resulting in incorrect classification of the AVM as Spetzler-Martin grade II.
