Table 3.
TOLF-DO grading system.
| Parameter | Score |
|---|---|
| Unilateral COR value | |
| <60% | 0 |
| ≥60% | 1 |
| Radiological features | |
| Tram track sign | 1 |
| C-sign | 2 |
| Tram track sign + C-sign | 3 |
The existence of DO was highly suspected when the score was larger than 2 points.
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