 There are postsurgical changes involving the right inferior frontal lobe, insula, and anterior temporal lobe. There is ill-defined mildly expansile confluent T2 hyperintensity surrounding the resection cavity. There is ex vacuo dilatation of the right lateral ventricle similar to previous. There is persistent linear enhancement along the medial margin of the resection cavity and along the ependymal lining of the right frontal horn and corpus callosum, which now measure up to 10 mm. However, there is interval increase in size of foci of subcentimeter enhancement along the lateral margin of the body and trigone of the right lateral ventricle. There is no midline shift. There is bilateral mastoid fluid, right more than left.
Posttreatment findings in the right cerebral hemisphere with increase in size of foci of enhancement along the lateral margin of the body and trigone of the right lateral ventricle, which may represent tumor progression versus treatment effects.