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Watershed-Distribution (WS) Pattern Injury Scale
| 0 | Normal |
| 1 | Single focal infarction |
| 2 | Abnormal signal in anterior or posterior watershed white matter |
| 3 | Abnormal signal in anterior or posterior watershed cortex and white matter |
| 4 | Abnormal signal in both anterior and posterior watershed zones |
| 5 | More extensive cortical involvement |
