Figure 1b.  (a) Axial intermediate weighted MR image of the cerebellum reveals an area of increased signal intensity in the left cortical gray matter (arrow). Both vertebral arteries are visualized (the right larger than the left) with apparent flow voids (arrowheads). (b) T2-weighted MR image obtained at the same level as a again shows high signal intensity in the gray matter of the left cerebellum (arrow). Vessel flow on the left side is not as well visualized due to cerebrospinal fluid signal.