6 x 4.5cm well defined lobulated homogenously enhancing mass involving the left thalamus, upper left midbrain, body and trigone of the left lateral ventricle, and part of the splenium of the corpus callosum. The mass extends into the left parietal periventricular white matter with resultant mild perilesional oedema in the left parietal lobe.
Enlarged lateral ventricles due to compressive effect of the mass on the third ventricle with periventricular high T2 signal due to transependymal oedema.