Primary CNS lymphoma status post treatment. There are postoperative findings related to left transfrontal biopsy. There is unchanged patchy T2 hyperintensity in the left corona radiata, basal ganglia, and insula, with minimal faint enhancement in this region. There is also unchanged patchy intrinsic T1 hyperintensity and susceptibility effect in the left basal ganglia enhancement at the biopsy site. There is unchanged patchy high T2 signal in the left cerebral peduncle without associated enhancement. There is no residual midline shift or herniation. There is diffuse cerebral volume loss with superimposed ex vacuo dilatation of the left lateral ventricle and Wallerian degeneration of the left brainstem. There is no acute infarct. There is an unchanged nonspecific enhancing lesion in the left parietal skull.
1. Treated CNS lymphoma centered in the left basal ganglia and left cerebral peduncle without evidence of tumor recurrence.2. Unchanged nonspecific enhancing lesion in the left parietal skull.