Table 2.
Associations between US findings and collapsed consensus classification of lesions as benign (benign, indeterminately benign) or malignant (indeterminately malignant, malignant)
| US characteristic | Collapsed consensus classification | Odds ratio1 (95 % CI) | P value | |
|---|---|---|---|---|
| Benign | Malignant | |||
| Mass texture | ||||
| Homogeneous | 72.2 % (26) | 27.8 % (10) | Reference | |
| Heterogeneous | 50.7 % (35) | 49.3 % (34) | 1.20 (0.33, 4.36) | 0.777 |
| Necrosis | ||||
| Absent | 65.3 % (49) | 34.7 % (26) | Reference | |
| Present | 40.0 % (12) | 60.0 % (18) | 1.63 (0.41, 6.42) | 0.488 |
| Echogenicity | ||||
| Hypo or mixed | 55.2 % (53) | 44.8 % (43) | Reference | |
| Hyper | 88.9 % (8) | 11.1 % (1) | 0.20 (0.05, 0.82) | 0.025 |
| Power Doppler | ||||
| Absent | 80.5 % (33) | 19.5 % (8) | Reference | |
| Linear | 59.3 % (16) | 40.7 % (11) | 2.19 (0.53, 9.09) | 0.282 |
| Disorganised | 32.4 % (12) | 67.6 % (25) | 7.79 (1.90, 31.94) | 0.004 |
| Position | ||||
| Subcutaneous | 56.7 % (17) | 43.3 % (13) | Reference | |
| Intermuscular | 51.4 % (19) | 48.7 % (18) | 1.11 (0.27, 4.49) | 0.883 |
| Intramuscular | 65.8 % (25) | 34.2 % (13) | 0.57 (0.12, 2.82) | 0.492 |
1From multivariable logistic regression model including all US characteristics