 No restricted diffusion abnormalities are seen.There is no evidence of intracranial hemorrhage, mass effect, or acute infarct. Extensive confluent bilateral cerebral white matter T2 hyperintensity is seen. No midline shift. Ventricular size is normal.There is enhancement of the right cisternal cranial nerve V which was very subtly present on the prior exam and not seen on older exams.There is a right frontal approach Ommaya catheter that terminates in the right lateral ventricle.Mucous retention cyst is seen in the left maxillary sinus.The visualized cerebral arteries and the visualized internal carotid arteries appears within normal limits.
1. There is enhancement of the cisternal right cranial nerve V, slowly progressive over the past 2 studies, concerning for recurrence of intracranial lymphoma.2. There is stable extensive T2 hyperintensity of the white matter, which is likely treatment related.3. Right frontal Ommaya catheter with the distal tip in the right lateral ventricle, unchanged.