Primary CNS lymphoma status post chemotherapy and transplant. Prior cerebellar signs. There are otherwise unchanged post-treatment and post-biopsy findings with patchy T2 hyperintensity and associated susceptibility effect in the right cerebellar hemisphere. There are new areas of high T2 signal in the right frontoparietal white matter that measure up to 20 mm in length. Otherwise, scattered punctate foci of T2 hyperintensity elsewhere in the white matter are unchanged. There are also unchanged foci of susceptibility effect in the left anterior cingulate gyrus and right globus pallidus. There is no evidence of acute intracranial hemorrhage, mass, or acute infarct. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The skull, orbits, and scalp soft tissues are unremarkable. There is mild mucosal thickening in the left maxillary sinus.
1. No evidence of recurrent CNS lymphoma amidst post-treatment findings, particularly in the right cerebellar hemisphere.2. New areas of white matter signal abnormality in the right frontoparietal region are nonspecific, but may represent small vessel ischemic disease or perhaps chemotherapy effects, for example.