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There is an ill-defined lesion within the left parietal and occipital lobe. This extends across the splenium of the corpus callosum in the deep periventricular right parietal lobe. Anteriorly, it also involves the left cerebral peduncle of the midbrain and the thalamus. It is hypointense on T1 and hyperintense on T2/FLAIR. Enhancement is demonstrated in the periventricular region, adjacent to the occipital horn with further enhancement extending anteriorly adjacent to the left temporal horn and the midbrain. Enhancement is also demonstrated involving the corpus callosum and in the right periventricular white matter. There is associated extensive vasogenic oedema with minimal mid-line shift.