Relapsed DLBC lymphoma to the brain, now status post 4 cycles of chemotherapy in need of restaging. There has been interval decrease in size of the patchy enhancement and associated T2 hyperintensity in the right peritrigonal region, which now measures up to 14 mm, previously 17 mm. There is unchanged background of nonspecific cerebral white matter T2 hyperintensity. There is no evidence of intracranial hemorrhage or acute infarct. There is no abnormal intracranial enhancement. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The skull, paranasal sinuses, and scalp soft tissues are unremarkable.
Interval decrease in size of the CNS lymphoma in the right peritrigonal region. 