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In a patient with a history of trauma, there is massive subarachnoid bleeding in right sylvian fissure (A) and parenchymal contusions in right temporal and frontal lobes (B). Axial MIP CTA images (C, D) show occlusion of right M1 segment and increased leptomeningeal-pial collateralization in the right MCA territory. Findings are compatible with postraumatic grade 5 dissection. Not: the arrow on C show middle cerebral vein spilling into the basal vein of Rosenthal.
