Figure 3. Coronal T₁ weighted enhanced images. (a) Ring enhancement in two lesions in the grey–white matter junction of the right cerebral hemisphere, and in a third in the region of the right basal ganglia. Each lesion shows associated local oedema with mass effect. (b) 3 weeks after anti-toxoplasma therapy, there has been resolution of the local mass effect. One lesion has disappeared. The lesion in the basal ganglia has shrunk and there is only a small residual focus of enhancement in the insular cortex.