Central nervous system lymphoma status post chemotherapy and radiation. There are chronic findings related to right transfrontal biopsy. There is no evidence of abnormal intracranial enhancement. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There are unchanged punctate foci of encephalomalacia in the right cerebellar hemisphere, which likely represent chronic infarcts. There are unchanged nonspecific patchy areas of T2 hyperintensity in the cerebral hemisphere white matter. The ventricles are unchanged in size and configuration. There is no midline shift or herniation. There are left maxillary sinus retention cysts. There is also persistent minimal fluid and mucosal enhancement in the bilateral mastoid air cells.
Stable post-treatment findings without evidence of intracranial central nervous system lymphoma recurrence.