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MRI shows a well defined intra axial space occupying lesion in the periventricular deep white matter of the right parietal lobe associated with extensive peripheral edema and mild midline shift.There is also another lesion in the peripheral aspects of the fourth ventricle.Following intravenous administration of gadolinium diffuse enhancement of the masses are noted.Note that the superior lesion also extends into the corpus callosum (best depicted in the post contrast coronal images) ,crossing the midline into the contralateral hemisphere and creating a butterfly pattern.In addition there is subependymal enhancemet along the lateral margin of the frontal horn of the right lateral ventricle in favor of subependymal tumor extension.