B r e a s t T u m o rs: C o m p a ra tiv e A c c u ra c y o f MR Im a g in g R elativ e to M a m m o g ra p h y a n d US fo r D e m o n s tra tin g E x te n t1 A PURPOSE; To evaluate the compara tive accuracy of magnetic resonance (MR) imaging relative to mammogra phy and ultrasonography (US) for assessing the extent of breast tumors. MATERIALS A N D METHODS:His tologic results and preoperative im aging findings (mammography, US, MR imaging) were analyzed regard ing tumor size and multifocality of 61 tumors in 60 women undergoing mastectomy for carcinoma. RESULTS:In 10% of cases, the index tumor was not seen at mammogra phy. With US, 15% of the index tu mors were not recognized, while MR imaging missed 2% of the index tu mors. On mammographic and US images, tumor size was underesti mated significantly (P < .005), by 14% and 18%, respectively, while MR im aging showed no significant differ ence in size compared with that found in a pathologic evaluation. Mammography showed 31% of the additional invasive lesions, w hile US showed 38% and MR imaging showed 100%. CONCLUSION: MR imaging was the most accurate of the three preopera tive imaging modalities in assessing the size and number of malignant lesions in the breast.

Gadolinium-enhanced TurboFLASH imaging is a valuable method in the examination of breast lesions suspected of being malignant.

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