Table 6.

Assessment of accuracy of the initial ultrasound-guided diagnostic breast biopsy by 8-gauge vacuum-assisted biopsy technique versus spring-loaded 14-gauge core biopsy technique for all cases in which a subsequent surgical excision of tissue from the same anatomical site of the affected breast was performed in an immediate fashion.

	8-gauge	14-gauge	All cases	P-value
Cases in which a subsequent surgical excision of tissue from the affected breast was performed in an immediate fashion	171 (23.6%)	471 (65.5%)	642 (44.5%)	<0.001
Histopathologic findings matched exactly for both the initial ultrasound-guided biopsy and the subsequent immediate surgical excision	168 (98.2%)	410 (87.0%)	578 (90.0%)	<0.001
Mismatch observed in the type of benign diagnosis	0 (0%)	37 (7.9%)	37 (5.8%)	<0.001
Misestimation of benign findings instead of invasive carcinoma	0 (0%)	7 (1.5%)	7 (1.1%)	0.199
Misestimation of benign findings instead of DCIS with microinvasive	0 (0%)	0 (0%)	0 (0%)	---------
Misestimation of benign findings instead of DCIS	0 (0%)	0 (0%)	0 (0%)	---------
Misestimation of high-risk breast lesions instead of invasive carcinoma	0 (0%)	0 (0%)	0 (0%)	---------
Misestimation of high-risk breast lesions instead of DCIS with microinvasive	0 (0%)	0 (0%)	0 (0%)	---------
Misestimation of high-risk breast lesions instead of DCIS	0 (0%)	1 (0.2%)	1 (0.2%)	1.0
Misestimation of DCIS instead of invasive carcinoma	1 (0.6%)	6 (1.3%)	7 (1.1%)	0.682
Misestimation of DCIS instead of DCIS with microinvasion	2 (1.2%)	0 (0%)	2 (0.3%)	0.071

* high risk breast lesions included atypical ductal hyperplasia, atypical lobular hyperplasia, and lobular carcinoma in situ. DCIS: ductal carcinoma in situ