 MRI Brain: There are unchanged post-treatment and post-biopsy findings with encephalomalacia and hemosiderin staining in the right cerebellar hemisphere. Areas of high T2 signal, most notably in the right periventricular parietal 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 right maxillary sinus.MR Spectroscopy: Spectroscopy was performed at multiple TEs of the dominant right periventricular parietal lesion as well as normal contralateral white matter. The spectroscopic patterns obtained from the lesion and from the contralateral normal tissue demonstrate minimal difference, if at all.
Sequelae of treated lymphoma of the right cerebellar hemisphere and left cingulate gyrus, which appear stable. Areas of signal abnormality in the right parietal periventricular region are stable as well with no evidence of new lesions. Spectroscopic assessment of one of the right parietal periventricular lesions demonstrates no evidence of any aggressive or actively proliferative process. 