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Correlation of Lesion Appearance and Histologic Findings for the Nodes of a Breast MR Imaging Interpretation Model

¹ Department of Radiology, Hahnemann University Hospital, Broad and Vine Sts, Philadelphia, PA 19102-1192 (L.W.N.)
² Department of Radiology, University of Pennsylvania Medical Center, Philadelphia (M.D.S., S.G.O., C.P.L., C.A.R., M.H.T.)
³ Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Mass (M.G.H.).

An interpretation model for evaluating magnetic resonance (MR) images of the breast was constructed that allowed differentiation of benign from malignant palpable or mammographically visible abnormalities. Architectural features define each node of the model. Investigation was subsequently made of the histologic findings in individuals within each node and of the frequency with which each histologic finding manifested as a particular architectural feature to determine whether nodal location and specific histologic findings are mutually predictive. The strongest associations were found between fibrocystic change and smooth masses, fibroadenoma and lobulated masses with nonenhancing internal septations, invasive ductal carcinoma (with or without ductal carcinoma in situ [DCIS]) and enhancing irregular or spiculated masses, invasive tubular carcinoma or radial scar and spiculated masses, medullary or colloid carcinoma and enhancing lobulated masses, invasive lobular carcinoma and the absence of a focal mass, DCIS and ductal enhancement, and DCIS (with or without invasive ductal carcinoma) and regional enhancement. Nodal location and histologic findings proved to be mutually predictive within the model; that is, the nodal location of MR imaging features within the model can be used to predict histologic findings and vice versa.

Index Terms: Breast, MR, 00.1214 • Images, interpretation • Magnetic resonance (MR), comparative studies, 00.1214

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