Fig 3. Co-registered MR imaging and PET images of a 1.9-year-old boy (patient 2) with Sturge-Weber syndrome and right hemispheric involvement. Contrast-enhanced T1-weighted MR images show a small posterior angioma as well as subtle enhancement in some transmedullary veins. FDG-PET shows no hypometabolism in the right hemisphere. In contrast, SWI demonstrates a number of prominent transmedullary veins in the right frontoparietal region (arrows on phase image); these are joining to a deep periventricular vein (arrowhead). These venous abnormalities are well visualized on the SWI phase images. Magnetic susceptibility effects are also seen in the region of the posterior angioma overlying atrophic right parietal cortex (thick arrow).