Table 4 Malignancy risk of four nodule categories based on composition and predominant echogenicity.
Solid hypoechoic | Partially cystic hypoechoic | Solid isoechoic | Partially cystic isoechoic | |||||
|---|---|---|---|---|---|---|---|---|
No. of malignant nodules/all | Malignancy risk (95% CI) | No. of malignant nodules/all | Malignancy risk (95% CI) | No. of malignant nodules/all | Malignancy risk (95% CI) | No. of malignant nodules/all | Malignancy risk (95% CI) | |
All | 705/1560 | 45.2 (41.9, 48.7) | 73/454 | 16.1 (12.6, 20.2) | 192/1481 | 13.0 (11.2, 14.9) | 119/2106 | 5.7 (4.7, 6.8) |
P | < .001a | 0.122b | < .001c | |||||
Any suspicious feature | 536/780 | 68.7 (63.0, 74.8) | 41/134 | 30.6 (22.0, 41.5) | 93/300 | 31.0 (25.0, 38.0) | 40/294 | 13.6 (9.7, 18.5) |
P | < .001a | 0.954b | < .001c | |||||
No suspicious feature | 169/780 | 21.7 (18.5, 25.2) | 32/320 | 10.0 (6.8, 14.1) | 99/1181 | 8.4 (6.8, 10.2) | 79/1812 | 4.4 (3.5, 5.4) |
P | < .001a | 0.385b | < .001c | |||||
