  Clinical Presentation： A 36-year-old woman with a history of heroin use presenting with diffuse headache, fever, and seizures. Further Work-up Imaging Findings： (A) Axial computed tomography (CT) without contrast shows a ring isodense to the gray matter (arrowhead) in the left frontal lobe. The lesion, located at the gray–white matter junction, has a hypodense center and is surrounded by vasogenic edema (arrow). (B) Axial T2-weighted image (WI) and fluid-attenuated inversion recovery image show the left frontal lesion with a rim of low intensity (arrowheads) and peripheral vasogenic edema. (C) Axial T1WI with contrast shows a round, well-defined, ring-enhancing lesion in the left frontal lobe (arrowheads). The inner and outer margins are smooth. (D) Diffusion-WI shows a “lightbulb” sign of the left frontal lesion (arrow). Differential Diagnosis： 1.Cerebral abscess 2.Metastasis 3.Glioblastoma multiforme What's your diagnosis ? Notes: 1. seizures ['si:ʒə] 癫痫 2. vasogenic edema 血管性水肿 3. abscess [ˈæbˌsɛs] n. 脓肿 4. glioblastoma [ˌglɪoʊblæ'stoʊmə] 胶质母细胞瘤 来源：每天朗读一段医学影像学英语文章 圈主 深圳市人民医院放射科副主任医师杨敏洁 |
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