Table 4.
BI-RADS categories of intraductal papillary neoplasms on ultrasound and mammography
| BI-RADS | Ultrasound (%) | Mammography (%) | ||||
|---|---|---|---|---|---|---|
| Benign (n = 116) | Atypical (n = 12) | Malignant (n = 32) | Benign (n = 116) | Atypical (n = 12) | Malignant (n = 32) | |
| 1 | 1 (0.9) | 1 (8.3) | 0 (0) | 10 (8.6) | 1 (8.3) | 0 (0) |
| 2 | 0 (0) | 0 (0) | 0 (0) | 25 (21.6) | 5 (41.7) | 4 (12.5) |
| 3 | 11 (9.5) | 3 (25.0) | 3 (9.4) | 39 (33.6) | 2 (16.7) | 3 (9.4) |
| 4a | 78 (67.2) | 5 (41.7) | 8 (25.0) | 24 (20.7) | 1 (8.3) | 10 (31.3) |
| 4b | 21 (18.1) | 2 (1.7) | 14 (43.8) | 19 (16.4) | 3 (25.0) | 11 (34.4) |
| 4c | 5 (4.3) | 1 (8.3) | 6 (18.8) | 1 (0.9) | 0 (0) | 4 (12.5) |
| 5 | 0 (0) | 0 (0) | 1 (3.1) | 0 (0) | 0 (0) | 0 (0) |