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A 48-year-old woman has experienced headaches for the past week. On physical examination her temperature is 37.6° C (99.7° F), pulse 73 bpm, respirations 16 bpm, and blood pressure 130/85 mmHg. She has a lumbar puncture performed. The cerebrospinal fluid (CSF) opening pressure is 220 mm H2O, the CSF protein 60 mg/dL, and the CSF glucose 75 mg/dL (serum glucose 105 mg/dL). A CT scan shows the findings in the image. Biopsy of the mass reveals gliosis and fibrosis with necrosis, neutrophils, and lymphocytes. Which of the following is the most likely diagnosis?