Article Figures & Data
Figures
- Fig 1.
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).
- Fig 2.
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.
- Fig 3.
Patient 3. Preoperative (A–C) and postoperative (D–F) axial images of a left thalamic ganglioglioma: 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 lateral displacement of the left PLIC (arrow in C); after surgery, DTI shows that the position has returned to normal.
- Fig 4.
Patient 4. Preoperative (A–C) and postoperative (D–F) axial images of the right striatal hemorrhagic cavernous angioma: 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 only slight displacement of the right PLIC. After surgery, DTI shows a preserved right PLIC.
- Fig 5.
Patient 1. Axial images of the brainstem. Before (A) and after (C) surgery, conventional T2-weighted images show subtle blunting of the right ventral surface of the pons (arrow). Preoperative (B) and postoperative (D) DTI reveals marked diminution of the CST in the right ventral pons, consistent with wallerian degeneration (arrowhead).
Tables
Clinical motor findings and DTI-determined CST involvement
Patient/Age (y)/Sex Pathology Location Motor Deficits CST Involvement on DTI Preoperative Postoperative Preoperative Postoperative 1/29/M Pilocytic astrocytoma R thalamus 2–4/5 L upper extremity 2–5/5 L upper extremity Decreased FA, deviated R PLIC Decreased FA, deviated R PLIC 2/20/F Pilocytic astrocytoma L frontal 4/5 R upper/lower extremity No deficit Decreased FA, deviated L PLIC Normalized L PLIC 3/46/F Ganglioglioma L thalamus 3–4/5 R upper/lower extremity No deficit Deviated L PLIC Normalized L PLIC 4/23/F Cavernous angioma R striatum No deficit No deficit Uninvolved R PLIC Preserved R PLIC
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