COMPARISON BETWEEN MAGNETIC RESONANCE IMAGING AND ULTRASONOGRAPHY AS THE BEST EXAMINATION TO MEASURE MALIGNANT BREAST TUMORS IN THE SURGICAL PLANNING

André J. R. E. Rossi¹, Ana C. G. Kluthcovsky², Mario R. M. Netto³, Fábio P. Mansani³. (1) .Academic Medicine UEPG; (2) PhD / Teacher UEPG. (3) Master / Teacher UEPG

State University of Ponta Grossa / Department of MedicineOBJECTIVES: The objective of this study is to evaluate which examination: ultrasonography (USG) or magnetic-resonance-imaging (MRI) is more accurate to size malignant breast tumors in the pre-surgical evaluation according to hormonal status. METHODOLOGY: This is a descriptive, cross-sectional study in which we performed a survey in the online-medical records system. We selected for the study all patients who underwent MRI and USG prior to surgical treatment. It was compared which larger tumor-size was visualized by MRI and USG before excision with the largest size visualized in the anatomopathological-report (AP) of the part, considered as gold-standard. The sample was divided according to hormonal-status: pre-menopausal, post-menopausal women who have already had hormone-replacement therapy (HRT), and post-menopausal women who have never done HRT. We evaluated which of the exams most approached the size of the tumor measured by anatomopathological-examination using the Pearson´s correlation-coefficient-(r). RESULTS: Of the total of 39-patients, all had invasive-ductal carcinoma (IDC), 19 (48.7%) were premenopausal, 10-(25.6%) were postmenopausal+HTR and 10-(25.6%) postmenopausal with no HTR. When a total sample was analyzed (n=39), it was observed that the correlation between USG and AP (r=0.73 p<0.001) was higher than the correlation between MRI and AP (r=0.57 p<0.001). In the premenopausal subgroup, the correlation between USG and AP (r=0.46 p=0.05) was lower than the correlation between MRI-and AP, (r=0.56 p=0,01). In the postmenopausal, Pearson’s-correlation shows that USG is better at assessing tumor size than MRI regardless whether or not the woman had HRT. Post-menopausal+HRT, the correlation between USG and AP (r=0.93 p<0.001), correlation between MRI and AP (r=0.82 p<0.01). In the non-HRT group, the correlation between USG-and AP (r=0.67 p=0.03) and MRI and AP correlation (r=0.32 p=0.37).CONCLUSION:It is concluded that the USG is sufficient examination for pre-surgical staging in IDC, but when available, MRI may be well indicated in premenopausal-patients.Breast cancer, Ultrasonography, Magnetic Ressonance Imaging.

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