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Figure 1. A 57-year-old man presented with a moderate left-sided hemiparesis. T1-weighted magnetic resonance images with gadolinium revealed a contrast-enhanced lesion in the internal capsule and the adjacent basal ganglia. Stereotactic biopsy revealed the tumor to be a high-grade astrocytoma. Consecutive axial T2-weighted magnetic resonance images demonstrate the tumor (pair of arrowheads in Panel B) in the internal capsule and the adjacent basal ganglia. In addition, a hyperintense signal shows that the pyramidal tract was affected from the pons to the corona radiata (single arrowheads in Panels A, C, and D). Because isolated malignant cells occur throughout . . . [Full Text of this Article] |