Extensive right frontoparietal white matter signal abnormality is seen traversing the posterior body of the corpus callosum to involve the left centrum semiovale and precentral gyrus. The abnormality extends to involve the subcortical white matter (subcortical U-fibers are involved) but spares the cortex. There is also increased inferior extent on the right, through the posterior limb internal capsule to the cerebral peduncle. Signal abnormality also extends just into the occipital and posterior temporal lobes on the right. This is associated with no mass effect or abnormal enhancement. Leading edge of diffusion restriction is present medially. Signal abnormality is all confluent with no new discrete lesion seen. No evidence of haemorrhage.