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Grading of TI-RADS
| Grade | Explanation | |
| Grade 0 | No completed imaging evaluation. Necessary for further assessment. | |
| Grade 1 | Negative | |
| Grade 2 | Positive | |
| Grade 3 | Suspicious benign (<5%) | |
| Grade 4 | ||
| 4a | Low-risk suspicious malignancy (5%–45%) | |
| 4b | Intermediate-risk suspicious malignancy (45%–75%) | |
| 4c | High-risk suspicious malignancy (75%–95%) | |
| Grade 5 | High-risk suspicious malignancy (≥95%) | |
| Grade 6 | Malignancy (to be proved by biopsy) |
