Images illustrating prominent laterality posterior (PLPCA) and anterior (PLACA) cerebral arteries: M1 segment of right middle cerebral artery occluded, right posterior cerebral artery dilated, and P4 segment visible, with visible P3 segment of left posterior cerebral artery (PLPCA); and greater visibility of right anterior cerebral artery vs. distal end of left anterior cerebral artery (PLACA).