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FIG 2. Imaging studies in a 43-year-old woman (case 1) with a large hematoma in the left occipitoparietal lobe.
A and B, Frontal (A) and lateral (B) late arterial-phase left vertebral angiograms show a small tangle of arterial blush (curved arrow) and a questionable early venous filling (straight arrow) along the parieto-occipital branches of the left posterior cerebral artery.
C, Superselective exploration of the parieto-occipital branch demonstrates the plexiform structure of the nidus of the micro-AVM, which is characterized by multiple arteriovenous shunts and a single deep draining vein coursing toward the vein of Galen.
D, The lesion could not be embolized because microcatheter tip instability and opacification of functional vessels originated from the distal tract of the feeder. The patient subsequently underwent successful surgery.
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