Table 2.

Outcomes of women who had pMRI or no pMRI

	Preoperative Breast MRI*
Variable		Yes (N=332)	No (N=41)	P- value
Number of Additional Core Needle Biopsiesa
Total number	0	231 (69.6%)	38 (90.5%)	0.002
	1	79 (23.8%)	3 (7.3%)
	2	18 (5.4%)	0 (0.0%)
	3	3 (0.9%)	0 (0.0%)
	4	1 (0.3%)	0 (0.0%)
Number with additional malignant findings	0	266 (80.1)	38 (92.7)	0.096
	1	55 (16.6)	3 (7.3)
	2	9 (2.7)	0 (0.0)
	3	2 (0.6)	0 (0.0)
Timing of Surgery†
Days between CNB and initial surgery	Median	48	48	>0.99
	Mean ± SD	54.8 ± 28.2	48.0 ± 27.3	0.14
>90 days between CNB and initial surgery		28 (9.7%)	4 (9.8%)	0.77
Type and Number of Surgeries
Total number of surgeries	Mean ± SD	1.2 ±0.4	1.5 ±0.7	<0.001
More than 1 surgery		50 (15.1%)	16 (39.0%)	<0.001
Initial surgery was a mastectomy		115 (34.6%)	13 (31.0%)	0.86
Final surgery was a mastectomy		138 (41.6%)	20 (48.8%)	0.41
Successful BCS (no mastectomy)‡		194 (89.4%)	21 (75.0%)	0.058
Single BCS‡		167 (77.0%)	12 (42.9%)	<0.001
Total number of surgeries‡	Mean ± SD	1.3 ± 0.5	1.7 ± 0.7	< 0.001

BCS = breast conserving surgery; CNB = core needle biopsy;

^*Values are mean ± SD, median, or n (%);

^†Based on a total of 331 women after excluding 42 women from the pMRI group who underwent MRI prior to the index CNB;

^‡Based on a total of 245 women (217 with pMRI and 28 without) who underwent BCS as their first surgery