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Arteriovenous malformation. Axial TOF MRA (a) and 3D MIP reconstruction (b) demonstrate flow-related enhancement in a tangle of serpiginous vessels in the left posterior frontal lobe (large arrows). Early arterialized flow-related enhancement is seen in large, abnormal draining veins and in the superior sagittal sinus (small arrows), reflecting shunting. MIP, maximum intensity projection; MRA, MR angiography; TOF, time-of-flight.
