Male, 31 years old, with oligodendroglioma, 1p19q co-deleted, surveillance imaging. A region of T2 hyperintense, nonenhancing parenchymal thickening is again seen involving the left superior and middle frontal gyri. Evidence of prior biopsy of this lesion is seen including visualization of the biopsy trajectory and placement of a titanium marker.There has been no significant interval change in the size or geographic extent of this lesion. As before, signal abnormality extends to the left body of the corpus callosum but does not cross to the contralateral side.No new parenchymal lesions are seen. No pathologic parenchymal or extra-axial enhancement is observed. The ventricular system is normal in size and morphology. A mucous retention cyst is unchanged in the left sphenoid sinus.
No significant progression of the left frontal lobe tumor.