Figure 2:

Grade 1 enhancement of a probably culprit plaque. A, TOF maximum intensity projection MR angiogram of the left middle cerebral artery shows mild stenosis in the M1 segment (arrow) in a 42-year-old man with a nearly occlusive basilar plaque. B, Pre- and, C, postcontrast 3D BB MR images (left: coronal acquisition) show wall thickening at the corresponding location (arrow). Right: Reconstructions perpendicular to flow direction through the wall thickening show an eccentric atherosclerotic plaque (arrow) with enhancement greater than that of normal intracranial arteries elsewhere but less than that of the pituitary infundibulum (*).