Lung adenocarcinoma with brain metastasis. Status post metastectomy and stereotactic radiosurgery. There are changes related to the resection of right frontal paramedian metastasis. The resection cavity is smaller and the adjacent white-matter T2-hyperintensity is remarkably improved with resolved mass-effect. Susceptibility artifact is present along the resection margin as well as contrast enhancement. This contrast enhancement is slightly thicker and more nodular than usual, especially along the superior and lateral margins. This likely reflect posttreatment change. There is no acute infarct or other foci of brain hemorrhage. There is no new contrast enhancement in the brain. Mild contrast enhancing dural thickening underneath the right frontal craniotomy flap is probably reactive. The overlying scalp postoperative changes are improved. The major intracranial vascular flow voids are preserved, including the superior sagittal sinus. There is minimal mucosal thickening in the paranasal sinuses. The mastoid air cells are clear. There is no gross orbital abnormality.
1.Expected post resection/stereotactic radiosurgery changes are present in the right frontal lobe. 2.The contrast enhancement along the resection margin is mildly thick and nodular, especially along the superior and lateral borders. This still may represent posttreatment change but residual/recurrent tumor can also look similar. Follow-up is recommended.3.No new brain metastasis.