Lymphoma, follow-up evaluation. Compared to most recent study, there is no significant change in mild enlargement and diffuse enhancement of the bilateral trigeminal nerves particularly in its cisternal segment and right foramen ovale. There is no new parenchymal or meningeal enhancement to suggest progression of disease. There is a stable right frontal approach Ommaya catheter. The ventricles and sulci are stable. There remains a similar extent of confluent T2/FLAIR hyperintensity within the bilateral cerebral white matter. The cisterns remain patent. There is no midline shift or mass effect. 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. There is an unchanged small left maxillary sinus mucosal retention cyst.CERVICAL SPINE
1. No evidence of progression of lymphoma in the brain or cervical spine. Cranial nerve enhancement as well as cervical nerve root enhancement is not appreciably changed since 8/4/2016.2. Stable extent of confluent areas of bilateral cerebral white matter signal abnormality, likely posttreatment changes.