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Patient 2. Preoperative (A–C) and postoperative (D–F) axial images of a left frontal pilocytic astrocytoma: contrast-enhanced T1-weighted images (A and D), T2-weighted images (B and E), and directional color maps (C and F). Before surgery, DTI reveals decreased FA (diminished blue in C) and posteromedial displacement of the left PLIC (arrow in C). After surgery, DTI shows both restored FA (normal blue in F) and normal positioning of the left PLIC.
