 There are postoperative changes from previous right frontal craniotomy. There are scattered foci of susceptibility along the margins of the right frontal lobe region resection cavity as well as along the ventricular margins which appears unchanged, and likely due to chronic hemosiderin deposition. The enhancement that was noted in the previous study along the posterolateral margin of the resection cavity is less conspicuous. There is persistent enhancement in the anterolateral margin of the resection cavity. The enhancing nodular tissue along the superior posterior margin of the right frontal lobe resection cavity is unchanged.There is a nonenhancing T2/FLAIR hyperintense mass in the cerebellum, along the right posterior-lateral margin of the fourth ventricle, which exerts partial effacement of the 4th ventricle. This is unchanged from the most recent exam and the minimally progressed since 5/7/2015.There is nodular enhancement of the right frontal horn abutting the mildly thickened anteromedial ependymal surface is decreased in size since the previous study, decreased from 17 x 16 mm to 13 x 9 mm.The T2/FLAIR hyperintensity along the left centrum semiovale and the left corona radiata is less well defined than on the previous study.The ventricles and sulci are within normal limits other than ex vacuo dilatation of the right anterior body of the lateral ventricle. The cisterns remain patent. There is no midline shift. There is no diffusion abnormality. No extra-axial fluid collection is identified.Normal flow-voids are demonstrated in the major intracranial vascular structures. The midline structures and craniocervical junction are within normal limits.
1. Interval decrease in size of the right frontal horn mass abutting the medial ependymal surface.2. The right paramedian cerebellar lesion that exerts partial effacement of the fourth ventricle is unchanged from the most recent study and minimally progressed since 5/7/2015.3. The enhancing nodular tissue along the superior posterior margin of the right frontal lobe resection cavity is unchanged.