Table 1.
Distribution of BI-RADS mass lesion descriptors, age and BI-RADS assessment categories in the training data (n=1276 lesions, thereof 138 malignant). Percentages denote the proportion of lesions with the specific descriptor in the respective descriptor subgroup.
| descriptor | n malignant (%) | n benign (%) |
|---|---|---|
| mass shape | ||
| round | 22 (15.9%) | 293 (25.7%) |
| oval | 26 (18.8%) | 569 (50.0%) |
| lobulated (4th edition) | 16 (11.6%) | 152 (13.3%) |
| irregular | 74 (53.6%) | 124 (10.9%) |
| mass margin | ||
| circumscribed | 15 (10.9%) | 733 (64.4%) |
| microlobulated | 7 (5.1%) | 13 (1.1%) |
| obscured | 12 (8.7%) | 169 (14.9%) |
| ill-defined | 51 (37.0%) | 205 (18.0%) |
| spiculated | 53 (38.4%) | 18 (1.6%) |
| mass density | ||
| fat-like | 1 (0.7%) | 64 (5.6%) |
| low | 1 (0.7%) | 57 (5.0%) |
| isodense | 35 (25.4%) | 690 (60.6%) |
| high | 101 (73.2%) | 327 (28.7%) |
| age | ||
| < 50 years | 18 (13.0%) | 465 (40.9%) |
| 50 – 64 years | 57 (41.3%) | 476 (41.8%) |
| >= 65 years | 63 (45.6%) | 197 (17.3%) |
| BI-RADS category | ||
| 0 | 37 (26.8%) | 566 (49.7%) |
| 2 | 0 (0%) | 431 (37.9%) |
| 3 | 0 (0%) | 77 (6.8%) |
| 4 | 40 (29.0%) | 60 (5.3%) |
| 5 | 61 (44.2%) | 4 (0.4%) |