Table 2.
Comparison of quantitative MRI features of malignant versus contralateral normal axillary lymph nodes (ALNs) in 34 patients with breast cancer.
| Malignant ALN Mean (SD) |
Normal ALN Mean (SD) |
p-value | |
|---|---|---|---|
| Kinetic features | |||
| Peak enhancement % | 440.6 (299.0) | 324.8 (226.9) | 0.11 |
| Washout % | 73.4 (20.9) | 72.4 (20.7) | 0.80 |
| Size | |||
| Angiographic volume (mm3) | 1.8 (1.9) | 0.4 (0.3) | <0.0001* |
| Manual volume (mm3) | 2.0 (1.7) | 0.4 (0.3) | <0.0001* |
| Maximum size (mm) | 19.4 (5.2) | 12.6 (5.7) | 0.0008* |
| Minimum size (mm) | 10.6 (3.2) | 5.7 (2.1) | <0.0001* |
| DW MRI features | |||
| Mean ADC (mm2/s) | 1.01 (0.2) | 1.14 (0.2) | 0.02* |
| Minimum ADC (mm2/s) | 0.51 (0.2) | 0.73 (0.3) | 0.002* |
p-values calculated by Wilcoxon signed-rank test
Abbreviations: DW = diffusion weighted, ALN = axillary lymph node, ADC = apparent diffusion coefficient
*
denotes statistically significant difference