. Author manuscript; available in PMC: 2015 Jul 20.

Published in final edited form as: Clin Breast Cancer. 2011 Mar;11(1):33–38. doi: 10.3816/CBC.2011.n.006

Table 2.

Choice of Initial Surgical Procedure and Surgical Outcomes

Surgical Measure	No MRI (n = 111)	MRI (n = 38)	P Value
Initial Surgical Procedure
Lumpectomy	95 (86%)	19 (50%)	< .001^a
Unilateral mastectomy	16 (14%)	17 (45%)	< .001^a
Bilateral mastectomy	0 (0%)	2 (5%)	.015^a
Sentinel node biopsy	25 (23%)	18 (47%)	.004^a
Surgical Outcomes (Overall Cohort)
Negative margins	99 (89%)	32 (84%)	.42^a
Margins larger than 10 mm	30 (27%)	5 (13%)	.082^a
Closest marginc (mean, cm)	0.26	0.21	.50^b
Surgical Outcomes (Lumpectomy Subset)
Closest margin in lumpectomy subset^c (mean, cm)	0.14	0.11	.47^b
Number reexcisions (mean)	0.42	0.58	.31^b

χ² test.

Student t test.

At first surgery, excludes widely negative margins.

Abbreviation: MRI = magnetic resonance imaging