Reason: DLBCL w/ CSF involvement. Receiving IT rituximab. History: CSF lymphoma. Images are somewhat limited by patient motion. There is stable ill-defined patchy T2/FLAIR hyperintensity along the medial right basal ganglia. There is no significant residual enhancement in this area. Previously seen FLAIR hyperintensity along the cerebellar tonsils in September 2015 is again no longer appreciated. The previously noted enhancement along the left optic nerve is not well assessed on this exam secondary to motion artifact.There is a stable right frontal approach Ommaya catheter with its tip in stable position along the right foramen of Monro. Ventricular caliber is unchanged.There is trace mucosal thickening in the right maxillary sinus and in scattered ethmoid air cells bilaterally. Flow-voids within the major intracranial vascular structures are present.SPINE
1. Persistent ill-defined abnormal signal although no significant residual abnormal enhancement along the right basal ganglia region likely representing evolution of lymphomatous involvement.2. Previously seen left optic nerve enhancement cannot be well assessed on this exam secondary to motion.3. No evidence of leptomeningeal disease within the spine.