Table 3.

Comparison of quantitative MRI features of benign versus contralateral normal axillary lymph nodes (ALNs) in 34 patients with breast cancer.

	Benign ALN Mean (SD)	Normal ALN Mean (SD)	p-value
Kinetic features
Peak enhancement %	398.7 (225.9)	411.7 (470.7)	0.38
Washout %	88.4 (12.8)	82.8 (16.8)	0.4
Size
Angiographic volume (mm3)	3.2 (4.5)	0.5 (0.6)	0.001*
Manual volume (mm3)	3.5 (5.9)	0.8 (0.7)	0.0002*
Maximum size (mm)	20.7 (9.9)	14.9 (6.3)	0.06
Minimum size (mm)	12.5 (5.3)	6.8 (2.8)	<0.0001*
DW MRI features
Mean ADC (mm2/s)	1.03 (0.2)	1.12 (0.2)	0.08
Minimum ADC (mm2/s)	0.44 (0.2)	0.69 (0.3)	0.003*

p-values calculated by Wilcoxon signed-rank test

Abbreviations: DW = diffusion weighted, ALN = axillary lymph node, ADC = apparent diffusion coefficient

^*denotes statistically significant difference