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Follow-up axial MRI images approximately 5 weeks following initial presentation. T2-weighted (A and B), T1-weighted (C), and T1-weighted postcontrast (D) images demonstrate marked interval enlargement of the mass centered in the right basal ganglia. Extensive interval T2/FLAIR signal hyperintensity and mass effect with right to left midline shift. The T2 hyperintense left basal ganglia lesion (B, arrow) is similar in size.
