82 -year-old woman with history of non-small cell lung cancer and lesion noted on recent CT. There is a rim-enhancing 12 x 11 mm lesion in the left inferior frontal lobe (series 1401, image 17) with an adjacent, 4 mm enhancing nodule immediately anterior. The left inferior frontal lobe lesion demonstrates increased central T2 signal, likely related to cystic degeneration or necrosis. There is vasogenic edema within the surrounding white matter of the left frontal lobe with increased T2 signal extending to the left frontal horn of the left lateral ventricle. There is minimal associated mass effect with effacement of the overlying left frontal sulci.There is no abnormal leptomeningeal enhancement, although 3D T1 postcontrast images are slightly limited by artifact. The major intracranial vessels appear patent.Extensive, bilateral scattered areas of increased T2 signal in the periventricular and subcortical white matter are nonspecific but most suggestive of chronic small vessel ischemic disease.No abnormality on diffusion-weighted images to suggest acute ischemia. No abnormality on susceptibility weighted images to suggest intracranial hemorrhage.
1.Rim-enhancing lesion in the inferior left frontal lobe with enhancing small satellite nodule. Associated vasogenic edema with mild sulcal effacement but no significant mass effect. Given the history, this is most compatible with metastasis.2.No additional enhancing lesions identified.