Metastatic NSCLC to brain treated with WBRT and growing left frontal lesion s/p resection. There are post-treatment findings in the left middle frontal lobe resection cavity. There is unchanged diffuse, confluent cerebral white matter T2 hyperintensity. There is no midline shift. There is no evidence of acute infarction or hemorrhage. There is fluid signal within the bilateral mastoid air cells and ethmoid sinuses. The orbits appear unremarkable.
Stable post-treatment findings without evidence of intracranial tumor recurrence.