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| Feature | n (%) |
| Tumor border | |
| Clear | 19 (90.5) |
| Unclear | 2 (9.5) |
| Internal reflectivity | |
| Low | 12 (57.1) |
| Low to medium | 5 (23.8) |
| Medium | 4 (19.1) |
| Parenchyma | |
| Homogeneous | 9 (42.9) |
| Heterogeneous | 12 (57.1) |
| Inner liquid dark field | 6 (28.6) |
