Table 1 Image definition
Variable | Classification criteria |
|---|---|
Location | Â |
 Type I | Tumor in which the contrast-enhancing lesion contacts both the SVZ and the cortex |
 Type II | Tumor contacts the SVZ but not the cortex |
 Type III | Tumor contacts the cortex but not the SVZ |
 Type IV | Tumor contacts neither the SVZ nor the cortex |
Tumor cross midline | |
 No | Tumor is limited to the unilateral cerebral hemisphere |
 Yes | Tumor crosses the brain midline and extends into contralateral cerebral hemisphere |
Multifocal | |
 No | Only one region of tumor, either enhancing or non-enhancing |
 Yes | At least a region of tumor, either enhancing or non-enhancing, which is not contiguous with the major tumor mass |
Necrosis | |
 No | No necrosis within the tumor |
 Mild | Necrosis affecting ≤50% of the tumor |
 Severe | Necrosis affecting > 50% of the tumor |
Cyst | |
 No | No cyst in the tumor |
 Yes | Cyst in the tumor |
Edema | |
 No | No convincing edema |
 Mild | Edema extending ≤2 cm from tumor margin |
 Severe | Edema extending > 2 cm from tumor margin |
Enhancement | |
 Nodular | Largest focal contrast-enhancement diameter of tumor ≤1.5 cm |
 Patchy | Maximum contrast-enhancement diameter of tumor>1.5 cm |
 Ringlike | Cystic necrosis with peripheral enhancement |
Side | |
 Left | Tumor located in left cerebral hemisphere |
 Right | Tumor located in right cerebral hemisphere |