There is a large ring-enhancing lesion expanding the pons, predominantly on the left, and extending into the left cerebral peduncle. Other similar small lesions are noted in the right cerebral peduncle and globus pallidus / posterior limb of the left internal capsule, with confluent FLAIR hyperintensity connecting all these lesions. There are some patchy foci of reduced ADC values within this lesions, predominantly peripheral, as well as mild elevated cerebral blood volume (CBV) in the enhancing margins. The single voxel spectroscopy traces exhibit a prominent lactate peak within the large pontine lesion and an unremarkable trace in the left basal ganglia region. Blooming artefacts at the inferior aspect of the pontine lesion may represent either haemorrhagic products or calcification, correlation with previous CT would be helpful. The remainder of the brain is unremarkable. The ventricles and basal cisterns are normal. There is no midline shift or cerebral herniation.