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| BA (n = 126) | O-ring sign (n = 26) | SC (n = 28) | |
| Low-grade dysplasia | 50 (40 %) | 14 (54 %) | 23 (82 %) |
| High-grade dysplasia | 49 (39 %) | 4 (15 %) | 4 (14 %) |
| Invasive cancer | 27 (21 %) | 8 (31 %) | 1 (4 %) |
