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Patient 1. Preoperative (A–C) and postoperative (D–F) axial images of a right thalamic 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 right PLIC (arrow in C). After surgery, DTI shows persistently decreased FA and displacement of the right PLIC (arrowhead in F).
