Magnetic resonance imaging (MRI) has been used for the local staging of @entity0 , especially to determine the extent of multiple lesions and to identify occult @entity5 . The aim of this study was to evaluate the effect of pre-operative MRI on the surgical treatment of @entity0 . Between January 2006 and May 2007, 535 newly diagnosed @entity0 @entity1 who planned to undergo breast conserving surgery had clinical examinations, bilateral mammography, breast ultrasonography, and breast MRI. The radiologic findings and clinicopathologic data were reviewed retrospectively. Ninety-eight (18.3%) @entity1 had additional lesions, shown as suspicious lesions on breast MRI, but not detected with conventional methods. Eighty-four (15.7%) of these @entity1 had a change in surgical treatment plans based on the MRI results. Forty-seven (8.8%) of the 84 @entity1 had additional @entity5 ;the other 37 @entity1 (6.9%) had benign lesions. The positive predictive value for MRI-based surgery was 56.0% (47 of 84 @entity1 ). During the period of study, the use of pre-operative MRI was increased with time (OR 1.20; 95% CI 1.16-1.23; P < 0.001), but the mastectomy rate did not change significantly (OR 0.98; 95% CI 0.95-1.00; P = 0.059). Multiple factors were analyzed to identify the @entity1 more likely to undergo appropriate and complete surgery based on the additional findings of the pre-operative MRI, but the results were not statistically significant. This research suggests that a pre-operative MRI can potentially lower the rate of incompletely excised @entity5 by identifying @entity5 prior to surgery and does not lead to an increase in the mastectomy rate; however, because some benign lesions are indistinguishable from suspicious or malignant lesions, excessive surgical procedures are unnecessarily performed in a significant portion of @entity1 . In the future, the criteria for the use of MRI in local staging of @entity0 should be established.

Does pre-operative breast magnetic resonance imaging in addition to mammography and breast ultrasonography change the operative management of XXXX ?

@entity5 :: ('MESH:D009369', 'Disease') :: ['malignancies', 'additional occult cancer'] @entity1 :: ('9606', 'Species') :: ['patients'] @entity0 :: ('MESH:D001943', 'Disease') :: ['breast cancer']
@entity0 :: (MESH:D001943,Disease) :: ['breast carcinoma']
