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Ovarian-Adnexal Reporting and Data System classification (O-RADS).
| O-RADS | Probability of Malignancy | Description |
|---|---|---|
| 0 | Incomplete assessment | |
| 1 | 0% | Normal/Functional |
| 2 | <1% | Most probably normal |
| 3 | 1–9% | Low risk of malignancy |
| 4 | 10–49% | Intermediate risk of malignancy |
| 5 | ≥50% | High risk of malignancy |
