Table 4. Proportion of undetermined diagnoses in SLN-CEUS and BUS.

Undetermined diagnoses‡	SLN-CEUS	BUS	P value*
Number	19	50†	–
Proportion	5.8% (19/327)	15.3% (50/327)	<0.001

*, P values are from the chi-square test. ^†50 cases of ‘undetermined diagnoses’ in BUS group includes 18 cases of ‘undefined’, 11 cases of ‘enlargement’, 1 case of ‘reduction’, 3 cases of ‘transformation after NAT’ and 17 cases of ‘suspect’. ^‡‘Undetermined diagnoses’ includes ‘unidentified’ in SLN-CEUS group and ‘undefined’, ‘enlargement’, ‘reduction’, ‘transformation after NAT’ and ‘suspect’ in BUS group. SLN-CEUS, contrast-enhanced ultrasound of sentinel lymph node; BUS, B-mode ultrasound.