Metastatic lung cancer, status post craniotomy and SRS. There are post-treatment findings in the left parietal lobe with a small area of linear enhancement and susceptibility effect in the surgical bed and surrounding confluent high T2 signal, as well as volume loss with ex vacuo dilatation of the left lateral ventricle. There are punctate foci of DWI T2 shine-through in the right occipital lobe without corresponding enhancement. There are a few other nonspecific scattered foci of high T2 signal elsewhere in the cerebral white matter. There is no evidence of intracranial hemorrhage, mass, or acute infarct. There is no midline shift or herniation. The major cerebral flow voids are intact. Aside from postoperative alterations, the skull and scalp soft tissues are grossly unremarkable. The orbits and paranasal sinuses are also unremarkable.
Post-treatment findings in the left parietal lobe with a small area of linear enhancement and susceptibility effect in the surgical bed, which is likely treatment-related, but otherwise no convincing evidence of active intracranial metastases. Punctate foci of DWI T2 shine-through in the right occipital lobe without corresponding enhancement may represent subacute infarcts.